SciDAVis - Improvements SVN-temp

EPS and PDF export
(closes feature request 1887933: Export graphs to EPS without rotation)

Remark: There is really no point in using QPrinter::Custom with Qt < 4.4,
it will use a standard page size anyway[1]. So I won't fix the stuff
related to custom page sizes until we have Qt and the new
plotting engine with floating point coordinates.)

References:
[1] http://trolltech.com/developer/task-tracker/index_html?method=entry&id=99441