added: Celle
First try on implementing PICA library system (copied a lot of code from
SISIS), details view and searches with only one result not working.
PICA library system now working with Kiel Uni library (I cannot
implement accounts since I don't have one yet). Had to add Cookie
handling to the BaseApi to make PICA work.
Reverted some changes in project.properties to make it the same as in
the original repository (I messed something up with the folders when
importing it to Eclipse so that the libraries were located somewhere
else).
Adjust httpPost to johan12345's changes to httpGet
Add Johann to authors file
added: Landau
added: Rastatt
CD icon for audio books in Celle
Bibliotheca: Warn about prolonging fees
Update javadoc
Bibliotheca and SISIS: Pending fees
SISIS: Fix prolonging errors
Fix index out of bounds error 

Parameter on RestoreSessionTask was missing when called form account
selection.
Prepare release 2.0.18