validateEBA plug-in fix typo affecting eba choice.
xbrlDB DPM database, skipDTS validation, use null for fact value that
is lexically invalid for its type
Merge branch 'master' of https://github.com/Arelle/Arelle

Conflicts:
	arelle/plugin/validateEBA.py
Merge branch 'master' of github.com:acsone/Arelle