Document name of V3d::View printouts is very long and cannot be changed by the application

Currently, there is a long, hard coded document name for print jobs, when you use V3d_View::Print. It is coded in OpenGl_Workspace::Print to be "Open Cascade Document - print v3d view".

This name can be seen in the print job list of your printer and it is used as filename if you use a pdf printer, e.g. FreePDF (http://freepdfxp.de).

We propose to change this hard coded document name to something shorter, e.g.: "print 3D view". The best would be to add it as a parameter to V3d_View::Print so that it can be defined by the application.