Fix hang on command line parsing

[nephros]

Some of the recent changes broke command line handling in some cases, causing
the patchmanager program to hang.

E.g calling patchmanger without any options, or -u without a parameter etc.

This reworks parameter handling, fixing these cases and very likely introducing new bugs.

It also drive-by introduces a --version switch that may be useful at some point.

• Declare help static
• Add a version() method
• Adapt parameter handling
• Adapt parameter handling II