CMakeLists.txt: use elseif token instead of elif which create strange issues with some cmake versions.
Fix minor issues in nsis config files

Fix minor issues in nsis config files

* Make Pcbnew net list dialog honor escape key on Linux.
* Make Pcbnew swap layers dialog honor escape key on Linux.
* Layout and UI policy fixes for Pcbnew swap layer and net list dialogs.
* Layout and UI policy fixes for Eeschema plot dialog.
* Rename fpip.h to fpid.h.
* Fix FPID class compiler errors.
* Restore fpid.cpp to Pcbnew static library source list.

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.

the crosshair after zooming.

This method is only used when the ALT key is held while using the mousewheel or
if it's permanently enabled in the options dialog next to the middle mouse
button panning option.

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 CheckCXXSymbolExists.cmake to fix configure bug using CMake versions prior to 2.8.6. (fixes lp:1124854)

add -fPIC for all builds, even cross comiling to Windows from Linux, even non Debug and Release builds

* 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.