Some classes return clones of their Properties fields instead of direct references (e.g. connectionProperties on OracleXADataSource). Modify PropertyUtils to handle such cases, and test the ResourceLoader's behaviour.
Merge remote-tracking branch 'btm/cloned-properties'

Conflicts:
	btm/src/test/java/bitronix/tm/mock/resource/jdbc/MockitoXADataSource.java