Eeschema, Pcbnew: fix minor issues about mouse cursor position, when loading files or entering sheets.

Pcbnew: Better selection of corners and edges in zones. Usefull when selecting edge/corner by right clicking on a zone outline,  for hight density boards.

Pcbnew: dialog copper zone: fix bug 726999. Remove unwanted resizing of dialog frame when selecting options.

Eeschema: bug fix:when clear annotation, delete annotation using current scheet only delete annotation of other sheets.

Use UTF-8 encoding only in kicad files. Under Linux, this was already the case. Under Windows, texts with  non ascii characters must be corrected.
This ensure compatibility between platforms.

* Merge three separate rotate code paths into a single rotate item function.
* Reduce three separate rotate command IDs into a single rotate command ID.
* Move pin rotate code into pin object.

* fix incorrect bounding box size calculation of schematic components.
* fix incorrect bounding box position and size used when schematic components are not found in lib (dummy lib componen used).
Pcbnew:
* Fix issues in block selection for arcs in modedit. Minor code cleaning.
CopyToClipboard: fix incorrect call to PrintPage (bad parameters)

kicad: fix Russian GOST page reference sheet - add field 24-25

Change board bounding box calculation to include all board items by default in pcbnew. Add a parameter to look for board edges only.

* Merge two duplicate case statement and delete pin code paths into a
  single delete function.
* Make all delete commands use new delete function.
* Fix a few set tool ID calls to use default cursor instead of arrow
  cursor.

* Make EDA_DRAW_FRAME current tool ID member variable private.
* Added global no tool selected ID to replace application specific no
  tool selected IDs.
* Change SetToolID to prevent setting the tool ID to anything less than
  the new global no tool selected ID and assert on debug builds.
* Change command and update user interface command event handlers to use
  new global no tool selected ID.
* Fixed schematic library editor add pin hot key handler.

Fix other issues.

Cvpcb: code cleaning.

* Remove global key press variable.  The key press is know passed to
  GeneralControl().
* Removed unused old mouse buttons global variable.

* Fixed ambiguous call to sqrt() MSVC compiler error.
* Fixed a bunch of type conversion warnings in GCC 3 (MinGW).

* CVPcb now uses wxUpdateUIEvent instead of set toolbars.
* Removed duplicate event handlers in CVPcb that were factored into
  EDA_DRAW_FRAME.
* Fix definition of GeneralControle() in CVPcb that prevented it from being
  called.
* Remove rarely used and scary refresh code GeneralControle() method in all
  main frame windows.
* Factor zoom menu and tool bar command IDs down to EDA_DRAW_FRAME.

* Old control state handling code completely removed in all applications.
* Factor common control state handlers into EDA_DRAW_FRAME.
* Replaced EDA_ITEM test for newness with IsNew() method.
* Factor vertical right toolbar command handlers out of giant edit command
  switch statement in EESchema and PCBNew.