initial implementation of label handling in partition
fixed addLabel()
unit tests for labels
getInheritedLabels
changed set to array for storing labels
changed label container to LinkedHashSet.
Handling case when a new label is already assigned to a child
initial implementation of partition details page with labels
Handling labels in parser and serializer
renamed Statement to PartitionStatement
renamed Statement to PartitionStatement
implementation of LabelStatement
Unit test for LabelStatement
getDescendingLabels()
getAllPartitionLabels()
parsing LabelStatements
disabled performance tests
refactored Statement implementation, implemented GUI for LabelStatement
fixed display of constraints page
dummy test method for infinitest