wxProcess::open does not work under windows (the process stays in background mode), wxExecute is still used under windows
Minor other changes

eeschema: code cleaning. SCH_ITEM class used for all schematic items in eeschema. Files reorganization.

Solved: eeschema crashes when create a new sheet. Added comments in gestfich.cpp to explain the default paths used by kicad to find help files and lib files

some code cleaning and comments translations. Added: EDA_Rect::Merge( EDA_Rect & aRect ) (see changelog)

demos installation added in CMakeLists.
Temporary problem with help appeared.

docs->doc and help->doc/help relocation. DO NOT UPDATE YOU WORKING COPY UNTIL MY NOTEsvn st! Huge files will be relocated.

* crash when creating a sheet that does not yet have a sch file
* when loading schematic file v 1 annotations are applied to all sheets independent of path in hierarchy
* component reference is drawn by default upon placing a new libary comp. 

================================================================================
+eeschema
        * commiting my changes to allow multiple instances of a given schematic file within 
a hierarchy:
        ** internally, m_currentScreen has been replaced with m_currentSheet,
                which is a list or 'path' of screens.  The path of screens is used to 
generate
                a series of timestamps, which is converted to flat component reference via 
a look-up
                table in the schematic files.
        ** this means that m_currentScreen is no longer used -- use GetScreen().
        ** GetScreen is virtual, as some of the dialogs keep around a WinEDA_BaseScreen 
pointer.
        ** all sub-sheets in a given schematic must have different names to generate a 
meaningful netlist.