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.

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.

* Add net list object creation functions to schematic component object.
* Remove external variables used by the verify bus label and parse bus
  label functions.
* Remove redundant net list object include sheet path member assignment.
* Add license statements to all modified files that required one.

* Define function to allow schematic objects to create their own net list
  objects.
* Add net list object creation functions to schematic line, junction, and
  no connect objects.
* Add license statements to all modified files that required one.

* Move the hierarchical label connected test into the NETLIST_OBJECT class.
* ERC pin type strings can now be translated.
* Remove unused EDA_DRAW_PANEL attribute from all ERC test functions.
* Add get marker count method to SCH_SCREENS object.
* Redundant header removal.
* Lots of coding style policy fixes.

(With a minor change for icon_cvpcb.svg: better look on dark backgrounds)
Fix bug 668200.

* Correct all user strings and comments for the correct capitalization of
  application names according to JP.  They are KiCad, Pcbnew, CvPcb,
  Eeschema, and GerbView.
* Add a note the the user interface policy about the correct capitalization.

* Translate French code names and comments.
* Dead code removal.
* Hot key object and structure coding style policy fixes.
* Doxygen comment warning fixes.

Fix minor issues.
Fic compil issue in dimension.cpp with wxMSW 2.8.12 (wxMSW 2.8.12 only).

Edit component in schematic: reduce length of some texts (when translated, give a too big dialog)

Fix compatibility issues with old xpm icons.
Add or update .xpm and .ico files for shortcuts and taskbars
Remove artwork folder.

* Replace use of wxICON by new icons declaration.
* Remove unused files.
* Fix filenames inconsistencies between old and new icons.
* dialog_erc handle variable size icons in erc matrix.

Fix minor other issues.
Remove unused files.

Code cleaning: rename DIALOG_LOAD_ERROR (a stupid name)  class to the more understandable  HTML_MESSAGE_BOX.
rename corresponding files are move them in a better place.

* Rename all ADD_MENUITEM_* functions to AddMenuItem and move them to
  wxstruct.h since they are used by the Kicad main frame classes.
* Move SET_BITMAP and SETBITMAPS definitions to wxstruct.h.
* Fix a bug in SET_BITMAPS that prevented enabling menu item images on
  OSX.
* Rename MsgItem to EDA_MSG_ITEM.
* Remove redundant includes from modified files.
* Doxygen and coding style policy fixes.

Add a new schematic item: SCH_BITMAP. One can insert now images in a schematic.
Add Fabrizio Tappero as contributor  in Kicad About dialog

* Warn the user that fields with no value and not it the field template list
  will be removed from the component before exiting the edit component in
  schematic dialog.
* Add a function to TEMPLATES class to check if template list contains a
  field with a given name.
* Move the function to display the edit component in schematic dialog into
  the SCH_EDIT_FRAME class.
* Doxygen and coding style policy fixes.