wxID_CANCEL, 5 pixel border around sizers, resizable search combobox, dialog_shim usage on a few dialogs

Pcbnew: plot Dialog: add a popup menu (try mouse right click in plot dialog) to selected/unselect groups of layers to plot.
All: For new zoom centering option: use Shift+Ctrl key instead of Alt key to select the new zoom centering, because Alt key has a special function under Windows.
2 very minor other changes.

Pcbnew: Export vrml: fix an issue for 3D shapes having a local offset defined: the local offset was not correctly scaled.

Commit patch from Antia Puentes relative to bug Bug #1125047 : PcbNew: Insert a footprint in the board, from the Library Browser, by double clicking on it, with a change to avoid the button release event (from the double click) to be seen by the main window.

* Add check for pad type and force drill size to zero if pad is surface
  mount in PCB_PARSER.
* Modify the D_PAD SetAttribute method to clear drill size if pad type is
  set to surface mount.

* Fixed spacing issue in pad properties dialog.
* Remove wxSHAPED flag from pad drawing panel to prevent assertion in
  wxSizer.
* Used sane default pad size and drill size settings to prevent wxRound
  assertions.
* Add license to class_board_design_settings.cpp.

* Improve the stable and testing build version option logic.
* Use CMake FindPythonInterp to configure the Python interpreter.
* Use Python interpreter to determine the system Python module install
  path if not already defined on the command line.
* Add header symbol checks for asinh(), acosh(), and atanh().
* Add test source to check for isinf() which can be defined as a C++template.
* Replace conditional compile on windows systems for aXXXh() with CMake
  configuration tests.
* A few minor MSVC compile fixes.
* Fix incorrect python environment string in fixswigimports.py
* Create a separate document for KiCad CMake build options.
* Create a separate how to compile KiCad on Windows document.

Pcbnew: Try to find a better workaround for zone fiill bug (crash or bad fil areasl in very rare cases).
pcbnew+Eeschema: Fix a very minor bug: filename not displayed in frame reference.

Pcbnew: rework on connection calculation: fix an issue for "composite"  pads (complex pad build by association of  some basic pads):
sometimes connections where not seen.

Very minor other fixes.

added option to allow zooming around the crosshair instead of the center; can be enabled via options or by holding alt while using the mousewheel

Changes for CvPcb to eeschema stuff file: the stuff file generation from CvPcb is removed. Eeschema now imports footprints names from the .cmp usual file created by CvPcb or by Pcbnew (Why to use 2 file formats for the same thing?) .
Pcbnew: in netlist dialog: The user now can choose between the netlist and the .cmp file to import footprints names.
Therfore no need to delete the .cmp file when exists to use only the netlist.
This is useful for users who use CvPcb only once to fill footprints fields in schematic, and after edit/modify the footprints fields in schematic outside CvPcb.

Pcbnew: Workaround to fix a crash when filling zone in Pcbnew nanometers (see Bug #1106451 ). Also happens with one of my boards.
Could be a bug inside boost::polygon. This is a workaround, because one never knows if this kind of bug is fixed.
However it fixes this issue for the 2 boards.

Pcbnew: fix a very old bug in DRC, pad to pad drc tests: sometimes a test between a rectangular pad and an oval pad was skipped.
Segment Hit Test: enhanced detection near segment ends (noticeable for instance when clicking on short tracks in Pcbnew.
Remove duplicate code about segment hit test.
remove unused file.

Eeschema: fix a bug which crashes Eeschema (when a label is being created, and its type is changed  by popup menu, for instance to a text, before it was put on schematic)
remove unused file and minor coding style fix

Still try to find a better fix for Bug #1100876, however I am thinking the bug is not in Kicad:
looks like a buggy version of wxWidgets is used, which sends sometimes an unwanted wxCommandEvent event,
when an event::Check() is called inside a function called by a  wxUpdateUIEvent event.

Pcbnew: fix bug Bug #1101399 (Custom page size gets reset after restarting pcbnew) (bug also in eeschema)
Try to find a better fix for Bug #1100876

It could be a race condition when setting the tools state on and off in PCB_EDIT_FRAME::OnSelectAutoPlaceMode( wxCommandEvent& aEvent ) on some Linux/wxWidgets versions
(does not happen on my computer)

 Make scripting version compilable on platforms where the python executable is not python2 (define it by -DPYTHON_EXECUTABLE=<python executable filename>)

Pcbnew: store in configuration the default line width (now  in mm), under a new keyword, to avoid a strange behavior of pcbnew in decimils version (old pcbnew versions), after running pcbnew in nanometers.

Kicad manager: fix a recent bug: project tree not updated when kicad is launched by a command line with a project name to open.
pcbnew: export vrml:
* move dialog functions in a new file: dialog_export_vrml.cpp.
* fix coding style issues
* patch add from cirilo Bernardo.