* auto-save was broken for all sub sheets with are in a sub-directory of the project directory. (reason wxFileName::Normalize(), used to create the absolute path  has issues with filenames starting by '$', perhaps due to env var which also start by $). the auto-save prefix is modified ( now AUTOSAVE_PREFIX_FILENAME which defines "_save_"  ) and defined only once.
* auto-save files from sub-sheets were not found due to the fact the path was not set (fixed by Blair Bonnet's patch)

Fix 2 coverity warnings.

added the example gen_gerber_and_drill_files_board.py in demos, which shows how to do that.
Fix a Printf format issue (shown in Debug mode) in Libedit (%d used for a size_t, changed in %zu)

Minor fixes: dialog rescue: make strings translatable. Remove a few coverity warnings (not initialized members). Very minor other changes.

Minor fixes in dialog rescue: missing title, incorrect refresh due to use of a wxPaintDC outside a paint event, and coverity warnings (not initialized members).

Eeschema: add missing rotate and mirror sheet in sheet context menu (these transforms were possible in block commands, but  not from the sheet menu).
Fix a i18n issue in field names when loading a component, if the language was changed during a session, and kicad not restarted (see Bug #1448654).
However changing the language needs restarting kicad, in order to have all messages or menus translated.

* Add code to test if any of the components in the schematic cache have been changed
  in the component libraries.
* Prompt user to accept or reject components when changes are found.
* If the user chooses to use the components in the cache, create a new library with the old
  components and add it to the beginning of the component library list so the schematic will
  not be changed.
* Create dialogs to handle user feedback and status.

* Use "Close" in the file menu of every main frame window instead of the
  mismatch of the terms "Close", "Exit", and "Quit".
* Change the terminology in the Pcbnew graphic text edit dialog to match the
  module text edit dialog.
* Improve the layout of the Pcbnew graphic text dialog.
* Fix some wxPrintf parameter type assertions for 64 bit time_t.
* Fix all (at least I think I got all of them) duplicate menu accelerator
  characters.

Now these parameters are stored in user config, not project config ( they are not really related to a given project, they are just a setup during an edition),
and the schematic editor and the component editor have now separate parameters, because they are separate editors with different constraints.
component editor: repeat pin enhancement (from and idea of Edward Johns)

ModEdit: fix a  refresh issue after deleting a pad (depending on the position of the pad, the pad was sometimes not immediately undrawn).
Fix a few coverity wanings (not initialized members in ctors)

Very minor coding style issue fix in hotkey code (pl_editor and gerbview).
Fix a compil error  using c++11 option for painstaking compilers

Dialog layers setup: cosmetic enhancements (fix a very minor issue on Windows). Remove a not used and outdated file.

Hide "Power component value text cannot be modified" in libedit (which should  be displayed only in schematic editor for power parts)

Previously, only the lib named "power" was used (and therefore power parts defined in other libs not shown).
Now, all power parts can be loaded from any library.
Also, when loading power parts from the chose component dialog or the lib viewer, libs and parts are filtered:  only power parts and libs containing power parts are listed.
Hotkeys: move a few global strings in the files where ther are actually used (and make them local.) and code cleaning.
Fix a few other minor issues.

3D viewer: fix (the fix is not perfect) a minor issue in zone rendering: copper thickness was not good when the option 'Show Holes in Zones" was OFF, and "Show Copper Thickness" ON.
Fix a few coverity minor warnings.

Eeschema: fix a crash on undo command, which sometimes happens after a wire /bus creation command was aborted.
(probably fix  Bug #1434988)

* The SCH_COLLECTOR m_foundItems was being obsoleted after a pin name search.
  If a library edit changed the found pin name, the cache still held the now
  missing library pin and would segfault on next search due to the cache being
  out of date.

Extend max number of units per package: fix incorrect unit string for unit >= 52. Fix unit list limited to 26 in dialof edit compinent in schematic..cpp
lib_pin.cpp: in 4 functions, use an unsigned param instead of int, for  a better code.

Eeschema: extend max number of units per package to 52 and clean code to easily extend this value upto 26x26  (but 52 is a reasonable max value).
Fix a few minor coverity warnings.
Add about_dialog typo fix from Nick Østergaard

eeschema: fix Bug #1437604 (double translation of some messages in pin editor dialog) relative to some static strings flagged "to be translated".
This is due to the fact static strings flagged translated ( _("string") notation)  are not translated  when they are static only if they are not inside a dll.
When they are static inside a dll, the dictionary is already loaded, and the constructor translate them.
Therefore they can be translated twice in dialogs are calling wxGetTranslation to show them, if the application is run from kicad.
But if the application is run as stand alone, the translation is made only once (as expected).

Fix minor 3D viewer issues (includling change number of segments and its optimization to draw pad holes.)
Fix Bug #1439132 (track and via list on toolbar not always refresh after loading a board).
Remove useless tool in Modedit.

Minor fixes: make a message translatable in CvPcb. Dialog choose component: fix a missing min size calculation and make min size bigger.

* Add footprint and drop table from the Pcbnew footprint library table menu
  entry to make it clear to new users.
* Add component to the Eeschema library configuration menu entry.

Eeschema enhancements: Option to annotate keeping multi-unit parts grouped and friendlier warning for modifying power values.

Make hotkey string info translatable in dialogs. These strings are now prefixed by _HKI , which can be used by translation tools to extract them.

Fix Bug #1426675 (Undo and cancel commands don't have effect for Duplicate operation in legacy mode)

Cvpcb: Shows a better message when a netlist is not found.