Eeschema: fix bug that crashes libedit (after creating a new pin, repeat it (insert key), delete the new repeated pin and try to repeat)

Pcbnew: fix bug in D_PAD ctor: m_LengthDie not initialized. Disable m_LengthDie read from .brd files,
because this bug breaks compatibility with older version of Pcbnew , and the stored value as most of time no sense.
To enable m_LengthDie reading, see class_pad.cpp

All: use double instead of int to store zoom values.

Speed up DIALOG_LOAD_ERROR::ListSet(), used to display lists of errors ( up to 100 x faster) in DRC or loading lib errors

    aModule->m_LibRef = aModule->m_Reference->m_Text;

It was copying placeholder for RefId (say, R*** or so) to pattern id (say it was RESC2012X55N)...

* Change the minimum required CMake version to 2.6.4 for all build platforms
  except Windows and OSX.
* Move all schematic plot code from plot.cpp into the appropriate schematic
  objects.
* Create SCH_SCREEN plot method to plot all objects in the schematic
  screen.
* Delete plot.cpp and remove it from the CMakeList file.

Altough it is a bad practice to have such files :)

* Move code from function ClearProjectDrawList() into SCH_SCREEN object
  Clear() method.
* Delete eeschema/delsheet.cpp as none of the code in it is ever called.
* Move global spice and net list command line variables into SCH_EDIT_FRAME
  object as priviate members and provide access methods.
* Remove unnecessary header includes from eeschema/sheet.cpp.
* Minor coding policy fixes.

- first, matches are now filtered with component filters (as set in eeschema lib editor);
- second, if two or more matches exist, first one will be accepted in accordance to
  alias file order set in project prefs, and then to order of lines in file.

For example you may have such configuration

.equ:
'100' 'CAP100'
'100' 'RES300' 

C component have filter 'CAP*'
R component have filter 'RES*'

So R with value 100 (IEEE/ESKD short for 100 Ohm) will get 'RES300' footprint,
and C with value 100 (IEEE/ESKD short for 100 pF) will get 'CAP100'.

Also equ read routine is rewritten so it is now gracefully accept UTF-8 and spaces.

Pcbnew: fix a minor issue.
Version update.

Annotation of multiparts gets CHINAME compared. This fixes bug when annotating components of same value (model) in several forms (e.g. dual opamp in single-body and dedicated representation).

* Fix debug build warning (lp:793373).
* Changed sheet edit restore and undo to use object copy and replace method.
* Add minimum width and height constraints when resizing sheets that have
  hierarchical pins.
* Fix drag sheet hot key bug.
* Change Doxygen configuration to extract private methods and members
  when creating documentation.
* Fix a bunch of Doxygen comment warnings.

dialog_about: add translator name.

Try to fix bug 639683 : Illegal reference strings are now detected and replaced by default prefix for old schematics or rejected in schematic edition.

Eeschema: add direct acces to LibEdit in popup menu, when a component is selected ( Whishlist #788621 ). This new command calls Libedit and load the lib component corresponding to the selected schematic component.

Libedit: actual line thickness  taken in account by collector. Thick lines are now more easy to locate. Fix incorrect boundary box calculations for LIB_PIN items. Very minor other fixes.

* Add drag context menu entry for junctions that actually form a junction
  with wires to EESchema.
* Add function to test for junctions to SCH_COLLECTOR class.
* Create annotate type and sort order enums to eliminate magic numbers
  used in annotate code.
* Remove duplicate Doxygen comments from annotate.cpp and improve the
  actual Doxygen comments in wxEeschemaStruct.h.