OPENOLAT-330: added catalog dropdown element to the course creation dialog, show only one create button always opening the wizard

OPENOLAT-330: new parameters inputClear, inputDropdown, highlight and limit for the FlexiAutoCompleterController,
now using bootstrap input-group for the autocompleter input element (dropdown and clear buttons) therefore needing some css fixes

OPENOLAT-330: removed obsolete function findExistingOlatCourses, allow * wildcards in the sis course query

OPENOLAT-368: sort list of external courses showing not yet created courses first and by title descending

OPENOLAT-367: show error message to user when there is an exception fetching the search results from the SIS

OPENOLAT-172: Fuzzify the searchstring also at the start for group search (possible performance problem)

OPENOLAT-257: Change the property handler for StudySubject to the new Generic254CharTextPropertyHandler (was the generic 127 char handler)