Eeschema, Plot dialog: add Plot directory selection. The patch from 1383026@bugs.launchpad.net was widely used.

eeschema: fix Bug #1385789 (eeschema segfaults, when editing a new field). Fix an other minor bug in Footprint editor.

* Add FindOpenSSL.cmake from CMake 3.0.2.
* Change MinGW find library to find libssl and libcrypto as well as libeay32 and ssleay32.  Apparently
 at some point OpenSSL changed the library file names for MinGW.
* Stop find_library() from looking in system paths and returning the actual DLLs rather than the link
  libraries.

* Use wxRenameFile which falls back to a file copy and file remove when
  wxRename fails.

* Make all files generated by make_lexer() dependencies of thier respective build targets.
* Make building Boost a dependency for all libraries.
* Remove duplicate make_lexer() call for Specctra lexer files.

python scripting: refinement for UTF8 class (from Miguel Ángel Ajo Pelayo) add __str__  method, usefull to print a UTF8 string.
Kicad manager: fix issues in file watcher: changes (adding/removing files)  in project folder not seen by Kicad manager (perhaps due to changes in internal wxWidgets code between 2.9.5 and 3.0).

* Exit script when package install, build configuration, or build fails.
* Install each dependency package one at a time.

* Write stable-release-policy.md for upcoming stable release.
* Remove unused Doxygen options from Doxyfile.

Python scripting: make UTF8 class accessible by python scripts. Add python method GetChars() to UTF8 class to get its char buffer.
See scripts/test_kicad_plugin.py for example.

* Improve VRML export dialog lay out.
* Make the OK button the default action in the export dialog.
* Make 3D model export work correctly and avoid redundant file copies.
* Fix embedded path separators in wrl files on windows.
* Fix absolute model file path creation in wrl files.
* Clean up VRML export code.

Pcbnew: fix Bug #1380943 (Filled polygons with thick outlines are missing last outline thick segment in gerber)
Remove a debug message in searchhelpfilefullpath.cpp.

* Change hot key editing contol from wxGridTableBase to wxListCtrl.
* Separate hot key lists into separate tabs rather than one large list.
* Coding policy fixes.

Archive function now recurses project sub directories.

Fix bug: Dialog "Page settings" does not always detect page format. Formats A, B, C, D, E, Custom (User) are detected right but A0-A4, US* are wrong.

Set wxNO_BORDER for the tab page.

* Many path related fixes.
* Fix execution of external applications.
* Update mac-osx.txt.
* Add top-level links for standalone applications inside OSX bundle.
* Fix document icons for Eeschema and pl_editor.
* Create individual bundles for standalone applications inside the main application bundle.
* Add usual 'site-packages' to python path in OSX bundle.
* Fix name of OSX bundle plugin folder.

Rename "Switch highcontrast" to "Toggle High Contrast".
Eliminate most of the abbreviated hotkey titles.
Doxygenize dialog_hotkeys_editor.h and add missing license block.
Display <unassigned> if key code is 0 (NULL).

Refactor hotkey editor to use tab control instead of one giant list.
Each tab is a separate hotkey section.
Modify EDA_HOTKEY_CONFIG to change the m_Comment member to m_Title for a new purpose.
We want a pretty title in the hotkey editor. We use m_Title for the key export comment which
still conveys the purpose just as easily.
Refactored usage of wxGrid into wxListCtrl which allows capturing navigation characters
and also works better (single selection is built in).
Add hotkey overwrite prompts that are paired with "Common" section. It will check if a hotkey
overlaps with the proper sections. i.e. Common with the all other sections; or Section 1 with just Common.
Right-click menu removed due to wxListCtrl being able to catch the special keys properly.

  * Include new field template editor
    - Removes 10 template limitation
    - Adds ability to set default value
    - Adds ability to set default visibility
  * Documentation to follow
  * Tested in Linux (Ubuntu 14.04) + Windows, Windows has issue with displaying highlight for selected template, fix to follow

Add missing search paths in kicad help doc search paths ( only noticeable for non English users ). Sometimes the translated doc was not found, and the English doc was displayed.