Revision 1331

(TransientJoinedTable.create): Make
	sure to use the right internal names even when joining on field
	with the same names in both tables. Also, detect duplicate names
	in the joined table correctly.
	If duplicates are found, append '_' (underscores) to the name
	until it is unique.
	Create always new internal names for the resulting table and reference
	columns in the join statement with <table>.<column>