Task #8887: modified specification update trigger to check for min_starttime, swap start-endtime, etc

Task #9309: added conflict_reasons, task and resource_claim relations. Added initial storage and bandwith set of conflict reasons. Added triggers to ensure db consistancy on task and resource_claim conflict status

Task #8570: renamed dir from ResourceAssignmentDatabase to ResourceAssignmentDatabase.from_branch_to_prevent_svn_conflict to prevent svn EvilTwin merge conflict. Rename back on trunk.

Task #8570: added tables resource_allocation.resource_claim_property_type and resource_allocation.resource_claim_property as replacement for nr_of_parts. Added view resource_allocation.resource_claim_property_view