Clean up some bash scripts, that are used for the generation of the
presentation.
Some improvements:
* Only ssh to fsmi-login if not already running on a fsmi host.
* Use the defined postgresql service instead of manually specifing the host
* Fix bugs that could occure when having spaces in filenames
* Find the fslogo.png in the root when generating the presentation
Signed-off-by: Tobias Wiese <tobias@tobiaswiese.com>