An ugly if-condition replaced with a CACHE'd cmake variable.

* Patch was taken from https://trac.macports.org/ticket/44524 for the upstream
  bug of http://trac.wxwidgets.org/ticket/16329.

Fix many doxygen warnings (due to missing info, old comments, typo ...) when building the doxygen doc.

Add check for correct wxGTK version report by wx-config. If incorrect cmake fails. Compare https://bugzilla.redhat.com/show_bug.cgi?id=1077718

Fix CMake warning caused by removal of boost dependency when not actually building boost from source.

* Move all Windows install subfolders from ${CMAKE_INSTALL_PREFIX}/share/ to
  ${CMAKE_INSTALL_PREFIX}/share/kicad/.
* Remove unused define DEFAULT_FP_LIB_PATH from build configuration.
* Remove Boost target when skipping internal Boost build.
* Update INSTALL.txt to reflect install tree changes.

Fix minor issues about translated strings and coding style. Add comment relative to file function info  in X1 gerber file format.

Pcbnew: Console python: use a wxMiniFrame to show the console and remove the management by a EDA_PANEINFO, which was not the right way to manage this console.

Pcbnew: Console python: use a wxMiniFrame to show the console and remove the management by a EDA_PANEINFO, which was not the right way to manage this console.

Pcbnew: fix a serious bug in ZONE_CONTAINER class copy constructor: a pointer was not initialized. Pcbnew crashes when deleting or filling a copied zone.
Eeschema: remove dead code and uncrutify class_netlist_object.h

* Add more missing source code licenses.
* Fix coding policy violations (tabs and trailing white space) in Python
  scripting code.
* Add stable release policy to full documentation build.

Kicad manager, Gerbview: When running Gerbview from Kicad manger, set the Gerbview  CWD to the current project directory.
Therefore, when trying to open Gerber files, the default directory is now thecurrent project directory.
(fix Bug #1380088 )

Cvpcb: Add a tool to solve conflict assignments when the schematic netlist and the .cmp file do not contain the same assignment and both are valid fpid.
It happens when footprint assignments are modified outside Cvpcb (when editing the footprint assignment field in schematic)

Kicad manager: fix Bug #1385953 (unable to open .PDF files with spaces in name/path when using default PDF browser).
Fix also an issue when selecting preferred browser.

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.