Fix erroneous test for non writable folder, when trying to save a schematic file with no path in name.
(seems wxFileName.IsDirWritable() fails under Windows when the path is empty (does not use the CWD).)

* Create command event handler for draggining all schematic items.
* Remove redundant delete item command handler code.
* Remove unused close current tool command ID from process special
  functions event handler.

* Create command event handler for editing all schematic and child items.
* Remove unique edit schematic item command IDs.
* Unify find item, undo, and redo hot key commands.

Now it select module from selected side if present. Especially handy in contrast view.

* Add a rotate event handler to schematic frame object.
* Remove unique rotate item command IDs.
* Use process event instead of post event to eliminate the need to clean
  up the command event client object from the heap.
* Unify find next item and next DRC error hot key commands.
* Unify move and rotate hot keys commands.

BOOST POLYGON is always used in zone filling functions.
Kbool is still in use in other calculations.

* Fix bug in draw reference for multiunit component
* Code cleanup for drag item

* Schematic fields now use unified move code.
* Move the unified move code into file schedit.cpp
* Remove old schematic field move code.

* Remove external dependency for adding suffix to reference designator
  fields.
* Make schematic field get and set position methods transform coordinates
  relative to the parent component object that owns them.
* Make base text class get text method virtual so derived classes can
  change the base string according to their individual requirements.
* Fix a problem with default place schematic item add in last commit.

* Tweak move item to support moving schematic sheet pin objects.
* Change schematic sheet pin set position to constrain position within
  the parent sheet.
* Schematic sheet pin moving now handled by unified move code.
* Remove old schematic sheet pin move code.
* Add custom client data object for passing hot key information to
  command event handlers.
* Fix a bug that prevented changes to schematic sheet pin objects from
  being undone.

* symbol in sch library have only single footprint filter,
* footprint filter have no wildcards,
* according footprint exists in pcb lib.
This could remove need in long equ files for lots of ICs.

* Fix a set position method bug in schematic item that caused the fields
  to drawn in the wrong position.
* Group zoom hot keys to use the same command event in schematic and
  library editor frames.

* Add get and set position methods to all schematic items.
* Encapsulate schematic item position members.
* Add swap data method to schematic items that lacked one.
* Remove global swap data function used by undo and redo functions.
* Unify as many schematic move methods as possible.
* Remove unnecessary place schematic item methods.
* All schematic items are now moved in the same event handler.
* Fixed bug in hierarchical sheet get menu item string method.
* Make no connect and junction items movable, fixes lp:804048

* Fixed bug on Windows that prevented the menu short cuts from working
  properly.
* Fix duplicate menu short cut keys in KiCad, Pcbnew, and Eeschema.
* Add menu short cuts for all possible menu entries.

Eeschema, Libedit: Use 16x16 icons in comboboxes inside the pin editor dialog. This gives a better look to this dialog.

Fix icons in macro menu.

Fix confusing labels in libedit (for pins and graphic items sharing)

* Grammar and spelling fixes in Eeschema, CvPcb, and Pcbnew path and
  library dialog tool tips.
* Translate the French file name subrill.cpp to highlight.cpp.
* Lots of coding style policy fixes.

Gerbview: very minor fix

All: fix some strings very hard to translate in messages.

* Factor test for auto save file into base frame class.
* Added auto save feature to Eeschema for saving schematics, addresses
  launchpad question 173631.
* Add auto save interval control to Eeschema options dialog.
* Fix problem with subsequent auto saves in last commit.

* Factor auto save common code into base frame class so all frame windows
  can take advantage of the shiny new auto save goodness.
* Use a timer instead of depending on mouse and keyboard events to trigger
  an auto save.
* Check for auto save file when opening a board and ask user if they
  wish to use the auto save file or the last saved board file.
* Protect all base frame public members.

* Add net list object creation functions to schematic sheet and label
  objects.
* Remove function to add schematic object net list items as it is no
  longer needed.
* Add license statements to all modified files that required one.