rewrote offscreen buffer (for glx, stubs for cgl and wgl), fixing scene export

added high-level SetOutline interface to gfx obj, added outline func to gfx entity
fixed cylindrical helix and flat strand mode (again, perhaps last time)
synchronized/fixed ost imports in init_cl.py and base/__init__.py
tweaked multisample initialization on QGLWidget
added several shortcut properties to gfx::Scene in python wrapper
added query aliases for cname (chain) and rtype=ext (rtype=strand)





git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2034 5a81b35b-ba03-0410-adc8-b2c5c5119f08