Remove the ability to specify argspecs in #implements.
Remove multiple inheritance from #extends.
Merge pull request #106 from bukzor/disallow_implements_from_argspec

Dissallow implements argspec and multiple inheritance
Set the default for nested defs to False.
remove allowNestedDefScopes
useSearchList invariantly.
Default useDottedNotation to False.
Remove autoAssignDummyTransactionToSelf.
Improve some coverage.
Factor out useKWsForPassingTrans
Factor out alwaysFilterNone
Remove #compiler reset directive.
Improve coverage moar.
Remove #compiler directive.
Remove unneeded global magic imports.