delete unused Job Log

-- Workstation --
- added a __init__ function to the WIMInterface which takes a list of
already configured programs as parameter

- added support for program configuration via database so that executables
which are not available through PATH can be used.

- changed the WIM so it returns pre-configured program informations and
only checks the PATH if the program isn't preconfigured

- added a Program table to the database to enable pre-configuration