Sanitize message strings used in dj.assert
Apply suppressPrompt consistently in dj.BaseRelvar.del()

If suppressPrompt is set, there should not be any user queries.
Apply this to the subtable warning in del() as well.
Fix dj.assert statement in dj.Schema.erd
Merge branch 'future' into simplified

Conflicts:
	+dj/AutoPopulate.m
	+dj/Schema.m