fixed VIM strings and some typos and newlines
use os.path.join for path concatenation

Bugs found by Felix Salfelder
configure matplotlib to work without X system

Use the Agg backend.

Bug report and code fix by Felix Salfelder
make gnucap dc command happy
gedaparts: use os.path.join, sanity checks, verbose fixes

* verbose was listed twice in getopt options
* always use os.path.join()
* use __file__ for BASE_DIR
* ind.read() of missing file does not raise an exception.
  added manual file checks
* added verbose lines from Felix Salfelder
fix model_status