added some new specialized Query classes
refactored the QueryGenerator
don't include method chaining in actual Query objects
beginning to work on the new query controller:
renamed the old one and add properties for current AQL and the selected corproa
also copy query and selected corpora in constructor
begin to implement the search functionality for the new controller: make it compile but not running
set multiselect before setting the property source
if we want to give "null" as argument we also have to give the type
replace getPreparedQuery()
mixed up left/right
getUI() is null in constructor, call the code later in attach
re-enable paging
show query in history overview
proberly remove the old tab
implement equals and hashCode for the different Query classes
re-implement context change
don't crash when there is no corpus selection
connect the export panel fields with the state
handle the export parameters
move export implementation to QueryController