This allows extension of test commands that evaluate the message somehow.
Currently this is implemented only for the message header.
Extensions can thereby influence what headers are evaluated and how.

lib-sieve: Implemented the index stringlist class which selects an item of the parent at a particular index.

This is needed so that argument validation functions can reliably verify other arguments at arbitrary positions.

The sieve_result_execute() function returned the wrong status result.

Implmented reporting full Pigeonhole version with hg tag so that builds between releases can be distinguished.
Copied from Dovecot for the most part.

This was caused by a circular reference.

Storage flag checks were bogus.

lib-sieve: Restructured result execution, so that all actions which involve mail storage are always committed before all others.

lib-sieve: Implemented sieve_redirect_envelope_from setting, which allows configuring the envelope sender of redirected messages.
Can either be set to the envelope sender, recipient, or orignal recipient of the processed message or it can be set explicitly to a static address.

It should only subscribe it when it is newly created.

These caused a BUG error to be reported during delivery.
Solved by signalling the occurrence of storage errors as a separate execution status flag, rather than querying the last storage itself for errors, which won't work.

Mail storage errors now trigger a runtime error.

lib-sieve: duplicate extension: Fixed erroneous compile error about conflicting tags when ":handle" argument was used last.

If the main script storage does not allow synchronization, it is now just logged as a debug message.

Logging was mixed up; it logged permanent SMTP failures as errors rather than mere info.
Redirect now handles temporary failure as a separate error condition, causing LDA to return a temporary failure if no other (storage) actions were performed.

Updated binary version.

Based on patch by Timo Sirainen.

Changed handling of ENOSPACE to a normal temporary failure and added handling of ENOQUOTA as a user error.
Patch by Timo Sirainen.

lib-sieve: file storage: Warning about active script not being a symlink was triggered at inappropriate times.
Fixed by issueing the warning only when storage is opened as READWRITE (ManageSieve).

Single script was only initialized and not actually opened.

The validate hook only worked for one extension.