Resolve virtual function name clashes:

Resolve virtual function name clashes:
* Rename InsetMinipage's width and height functions as pageWidth and
pageHeight, respectivelyi as they are functionally distinct from
the InsetCollapsable's methods of the same name.
* Change the "bool const &" parameters of UpdateableInset::searchForward and
searchBackward to "bool". Ditto with other classes, so all are now consistent.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3375 a592a061-630c-0410-9148-cb99ea01b6c8