Fixes the bug that causes pcbnew crash, when there are multiple net classes and the plot dialog was opened.
Changed NETCLASS* to boost::shared_ptr<NETCLASS>.

Pcbnew: plot dialog: remove obscure and useless option about texts which are not value or reference.
cosmetic enhancement in dialog.
page layout: fix bug Bug #1320839 (canvas refresh countinously called when moving an item)

- Create KiCad road map document.
- Add road map to developer's documentation.
- A separate road map build command to CMake so the road map can be built
  separately for use in websites.
- Update .bzrignore to ignore road map files generated by Doxygen.

Do not pay attention to add/remove files - it seems there may be a bug in git-bzr-ng plugin. I have checked them, they stayed exactly the same as before.

TRACK::GetTrack can now be told to confine search to the netlist and/or force the sequential (restartable) algorithm
Reworked the collinear track routines. Cleanup should be faster given the above modification.

Pull unfilled polygon drawing thru the line clipper; GTK mess up even in this case and the sheet border lines glitch on the screen at high zoom otherwise in pcbnew.

Made the project default text size apply to all text things in eeschema, instead of the hardcoded value

Removed SetCurrentClassName() (it was not used anywhere and less safe than SetCurrentClass()).
Added BOARD_DESIGN_SETTIGNS::GetDefault() to make some pieces of shorter and clearer.

DXF export: fix incorrect export of polygons having thick outline (like zones): Thick segments of outline were drawn like lines with no thickness.
Fix ( workaround only) crash (Windows only) when a quasi modal frame (like footprint viewer) was called from a dialog (like the component properties dialog in schematic editor).
Very minor other fixes.

Moved background color settings from GAL to RENDER_SETTINGS. Added RENDER_SETTINGS::TranslateColor() to convert between EDA_COLOR_T and COLOR4D.

- Better shape to the 60617 pin markers
- Made the markers' size proportional to the pin text
- Added the missing implementation in the pin plot routines

Most of the changes are just adding GetDesignSettings() before every occurence of m_NetClasses.
More complex changes:
class_netclass.cpp - NETCLASS does not store the pointer to the parent BOARD anymore. Added function SetParams( BOARD_DESIGN_SETTINGS& ).
class_netclass.h - Removed GetTrackMinWidth(), GetViaMinDiameter(), GetViaMinDrill(), GetuViaMinDiameter(), GetuViaMinDrill() as they were refering to BOARD_DESIGN_SETTINGS anyway (they are not net class specific).
kicad_plugin.cpp - filters out empty nets (that are anyway not saved) when storing net class information. Previously it was done in NETCLASS::Format() function.

Moved a few one-liners of BOARD_DESIGN_SETTINGS class to the header file.