Check subversion version control status

checkVCstate can help to keep track data provenance (which scripts and functions were used to generate some output).

It takes a list of function names and files as argument. It will then determine which files are called by a certain function name and then iterate over all filenames:
- check if the file is under version control
- if so check for local modifications, last committed revision number

A short output is printed on the command line.

The status of the files are returned. Optionally unversioned and modified files can be stored to a zip file.

Remarks:
- The functions works not recursively so functions called by a functions are not tracked.
- The function works right now only if tortoise SVN is used on windows and on the path (but it should be not too hard to adjust)