see #25 initial support. Needs more refinement

* filter latex output
* add a test case
see #26 -v now turns on debug mode
see #25

run mkindex only if an idx file is generated

* filter latex output
* add a test case
#26 try to derive output folder from input folder / input file
#25 improved latex handling and logging
see #25

added test for index generation

see #27
added test for latex messages