[PATCH] Support for arbitrary main script names in Python plasmoids

[Luca Beltrame]

Hello,

currently if you use Python plasmoids the main script *must* be named 
"main.py" because it is hardcoded into pyappletscripts.py. When using a 
different mainscript in the .desktop file (like Plasmate does) this will 
ensure the plasmoid will not run (you get a NameError exception).

The attached patch fixes this by retrieving the mainscript file, stripping it 
to its name and then using Python introspection (__dict__) to pass the right 
module name to the CreateApplet call. 

After applying, old plasmoids (using main.py) and new ones (using *any name*) 
seem to work correctly.

OK to commit? Should this also be backported?
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