adding file "How_to_translate_GUI.sxw" which explains GUI translation and kicad code optional changes

* 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. 

counterparts, will be connected together if they have the same label (name) and are on the same sheet. 

  Added item "Delete" in "Edit" menu.
  Added menu "Place" with all possible 
elements from the right toolbar.

* made schematic loading of 'GLabels' dependent on the schematic file version (currently at 2). 
If the version == 1, these are loaded as hierarchal labels
* made text labels global in the herarchy, consistent with their historical usage. 

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+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.