Task #3571: MACScheduler uses modificationDate. Modifying an already scheduled tree will immediately result in a new parsetfile for that observation/pipeline.

Task #3571: Added modificationDate field to OTDBtree information. The field is automatically updated to the
current time when a value or limits field in the corresponding tree is updated.

To upgrade an existing database run the 'upgradeOTDB' sql script on the existing database.

A new C++ function and SQL stored procedure is available: getModifiedTrees(after, treetype)
'after' : all trees that where modified after the given time are returned.
'treetype': limit the selection to the given type (0 for no limitation).

Task #2699: unittest_runner returns the number of failed tests as exit status. However, the test framework treats exit status 3 as a skipped test. Moreover, since CMake doesn't provide a means to skip tests at run-time, exit status 3 is converted to 0. Hence, a run with three failing tests will inadvertently be flagged as 'passed'. This has been fixed by converting a non-zero exit status of unittest_runner to 1.