Encapsulation, bug, context menu string, and, coding policy fixes.

* Complete encapsulation of the ZONE_CONTAINER class.
* Fixed a bug in the EDA_TEXT::Format() default effects behavior due to
  improper conversion to internal units and missing test for default
  thickness.
* Improved grammar of some Pcbnew context menu strings.
* Moved some more cleverly hidden BOARD object methods into class_board.cpp.
* Lots of coding policy and documentation fixes.
Pcbnew, ModEdit: fix issue when setting anchor position, and minor code cleaning.
eeschema: fix build when KICAD_GOST ON (insert in bzr4019)
Very minor changes in dialog zones.
Pcbnew: fix issue in zone keepout dialog: layers not displayed on Linux
Fix SCH_FIELD get reference designator text bug. (fixes lp:1159401)
Pcbnew: fix issue in zone keepout dialog: layers not displayed on Linux, and minor changes
Pcbnew: fix issue in zone keepout dialog: layers not displayed on Linux, and minor changes
Pcbnew: Fix a collision name between 2 methods: EDA_ITEM::GetFlags() and ZONE_CONTAINER::GetFlags(), which creates a very strange behavior when creating/edition zones.
ZONE_CONTAINER::GetFlags() is now named  ZONE_CONTAINER::GetLocalFlags().
Pcbnew: fix an issue when texts in footprints have a size = 60 mils (default size for texts). After saving and reading the .kicad_pcb file, the size was not correct.
Fix field text position access bug in Eeschema. (fixes lp:1160214)
Pcbnew: Fix Bug #1160396
Removed unused define TEXT_VTAB_HEIGHT
remove interrim fix, no longer needed
reference a test program in a comment
Renamed global variables:

Drc_On => g_Drc_On
Route_Layer_TOP => g_Route_Layer_TOP
Route_Layer_BOTTOM => g_Route_Layer_BOTTOM
Track_45_Only_Allowed => g_Track_45_Only_Allowed
Commit patch for x3d file reader (with minor changes). Commit other minor patches and fixes
Better fix for bug #1155888
all: new Russian GOST patch - author Konstantin Baranovskiy
pcbnew: fix print format in THROW_IO_ERROR
        fix properties file export_vrml.cpp
Extremely trivial stuff (mostly cosmetics)