Eeschema: fix issues in drag command (mainly hotkey command and forgotten wire ends connected to components to drag).
 Rename EDA_Rect::Inside to EDA_Rect::Contains ( EDA_Rect::Inside( const EDA_Rect& aRect ) was very ambiguous )
 Fix some Doxygen warnings and erroneous comments; Add comments.

Minor cosmetic enhancements.
commint forgoten files in boost lib.

    Added: in file dialog, multiple file selection.
    Added: Draw mode selector (in left toolbar):
        Raw mode:
            a Gerber image is drawn on screen without buffering.
            Artifacts happen if there are negative items drawn, if more than one  Gerber file is shown.
        Stacked mode:
            each Geber image is drawn in a buffer and after drawn on screen
            No artifact with negative items.
            Each Gerber image covers previous images.
        OR mode (transparency mode):
            each Geber image is drawn in a buffer and after drawn on screen
            No artifact with negative items.
            Each Gerber image is "ORed" with previous images, like in Pcbnew.
    Try to optimize Draw function in buffered modes.
        (Useful for PC that have problems with "blit" graphic function)
    Fix minor issues.

Fix Gerbview issue (does not display gerber images) when Gerbview is compiled with USE_WX_ZOOM defined.

Pcbnew: For zone filling algo, change the default polygon library from Kbool to Boost::polygon (USE_BOOST_POLYGON_LIBRARY default is ON). (need to rebuild makefile)
Gerbview: added decimal format for coordinates, sometimes found in Gerber files.

Gerbview:  Added support for complex definitions of parameters (like $3=$2+5/2)  in aperture macros and primitives macro.

minor cleanup. minor enhancements. Finish file housekeeping. add Bug 682586 fix from Mark van Doesburg.

can be deleted later if they exist in the headers, or moved to 
headers if they should exist in the headers.

Gerbview: remove useless calls to SetToolbar() which create horizontal toolbar flicker under Windows.

Gerbview: fix an issue with gerber files having a line comment starting by G04 and a command after this comment, on the same line.

Gerbview: support for plot lines (currently: not arcs) with a rectangular pen (Yes, it exists!). pcbnew: try to fix an issue when exporting arcs in gencad.

Gerbview: Fixed compil problem in debug Mode. Pcbnew: try to fix an issue in export gencad  (incorrect rectangular pads)