#136 Usability: POVRay GB in Expert Client

[Ralf Ratering]

I created a one-step POVRay workflow.
I loaded the scene file into the editor, specified
the target system and submitted the wf.
It failed, because input.pov was missing.
Manually adding the filename that was used in the
editor to the workflow input paramters section is not
good from a usability point of view.

[Valery Shorin]

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implemented, test it please

[Vladimir N. Ryabinin]

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Tested. The scene file can be loaded via Editor. This works Ok now.