basic CaseDatastore functionality implemented and used

CaseDatastore:
implemented:
+ getAllCases
+ getCaseForId
+ getOpenCases
+ getClosedCases
+ getOldestUnresolvedCases (no limit yet)
+ getRecentCases (no limit yet)

CaseServlet, CasesServlet
+Updated CaseServlet and CasesServlet to use new methods
+For the Moment, Dates do not work properly

CaseDetail, CaseNote:
/disabled Dates for now, as they are causing problems
/ tried to generalize list factory method, not yet good enough

DatastoreInterface:
/ Fixed wrong redirection call
+ getClosedCases
+ getRecentCases
Fixed dataTestSet

-CaseDetail with id 4 had illegal date time, this caused an exception
Merge branch 'workbranch'

Conflicts:
	dataTestSet.txt
	src/ch/ethz/inf/dbproject/model/CaseDetail.java
Resolved Conflicts