some cleanup of glDelete calls to guard against bugs caused by GL

some cleanup of glDelete calls to guard against bugs caused by GL
changing the binding when we delete a currently active object

fix a major resource leak by calling R_FrameData_NewFrame and
R_BufferData_NewFrame earlier so that they work when disconnected

improved gl_vbostats output

clarify some logic related to r_batch_dynamicbuffer

don't bother destroying a temporary vertex buffer that we end up
destroying as part of the array cleanup

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11956 d7cf8633-e32d-0410-b094-e92efae38249