Avoiding global variables

[R-e-d-J]

I'va take the time to read all your code and I see you're using a lot of global variable:

global strvarCmdArgs
global k2pdfopt_cmd_args
global strvarOutputFilePath
…

It's almost never a good idea. May be you can find a solution to avoid that and to be closer to the Bests Practices recommandations.