Fix bug 1749. CAUTION: lyx2lyx not fully working yet (see FIXMEs).

Fix bug 1749. CAUTION: lyx2lyx not fully working yet (see FIXMEs).

* development/FORMAT:
	- document file format change

* src/Buffer.cpp: bump format to 275.

* lib/lyx2lyx/LyX.py:
* lib/lyx2lyx/lyx_1_5.py:
	- conversion and reversion of scaleBeforeRotation param (doesn't work yet!)

* src/insets/InsetGraphicsParams.{cpp,h}:
	- new param scaleBeforeRotation
* src/insets/InsetGraphics.cpp:
	- swap order of scale and rotate (if scaleBeforeRotation is false)

* src/frontends/qt4/QGraphics.C:
* src/frontends/qt4/QGraphicsDialog.{cpp,h}:
* src/frontends/qt4/ui/GraphicsUi.ui:
	- add checkbox to toggle scaleBeforeRotation.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18885 a592a061-630c-0410-9148-cb99ea01b6c8