OPAL-2671 ViewManager decorator was keeping a reference to the decorated datasources: ask for the decorators to release removed datasources (whether transient or not).
OPAL-2669 Concurrency error
Robustness of excel datasource (case variable row is null)
PMD fix
Merge remote-tracking branch 'upstream/master'
changes in poms and gradle. Created copy of AbstractMagmaTest for avoiding circular dependencies