Envelope: <> return path now always matches as the empty string, regardless of the specified address part.

Imapflags: resolved problem of hasflags encountering duplicate flags in flag lists contained in a variable.

Significantly improved handling of old/corrupt binaries and revised matching implementation in the process.

Fixed code emission for extension-defined variables and removed hardcoded paths from include extension.

RECOVERED FROM INCONSISTENCY: developed testsuite and binary dumping and fixed various small issues.

Almost finished implementing the store action. But, I still get strange errors when the mail transaction commits. Mail is stored though.

Created skeletons for regex and relational extensions. These are to be developed simultaneously with the match-type support in general.