lib-sieve: Fixed handling of global errors. If master and user error handler were identical, in some cases the log message could be lost.

lib-sieve: result: Fixed handling of implicit keep for a partially executed transaction that yield a temporary failure.
It would probably result in message duplication.

LDA Sieve plugin: Made sure there is always a proper error handler for the implicit keep action during multiscript execution.
Should fix reported bug on missing message-ID in log.

This would probably cause a segfault at multiscript errors.

Should not dereference array_idx() result on the spot.

Error code was not passed back to caller, so that it operates on an uninitialized value.
Bug found by CLang warning.

It is now named pg_t_str_trim() to prevent a new conflict at the next attempt.

Included scripts now execute in the context of the inner parent foreverypart loop.

An empty string yielded an empty string rather than "0".

The free handler of code dumper extensions was never executed.

Needed for test suite.

When the program crosses the boundary of the current jump somehow, the program is terminated and a corruption error is returned.

lib-sieve: mime/foreverypart: Fixed code dumping of `:param' argument. It erroneously reported a code corruption.

lib-sieve: Created special stringlist class for message headers, so that header names can also be returned by the iterator.

lib-sieve: Moved handling of implicit keep during multiscript execution outside the script sequence itself.
Before, implicit keep was executed as part of the final script execution. This caused the implicit keep to be executed as part of that script, including global context.
This caused insignificant errors during delivery to be logged as errors in the administrator log when the last script is global.

This makes this available for other extensions.

These will influence some of the performed tests.

doveadm sieve plugin: Added proper handling of Sieve storage initialization failure occurring when sieve_enabled=no

This allows completely disabling Sieve processing for a particular user.

It now extracts bare text from HTML/XHMTL parts.
Other text/* parts are still returned as is. Any other unrecognized content types are skipped.

This allows setting the MAIL FROM of the SMTP envelope for the notification e-mails.
The syntax is identical to the sieve_redirect_envelope_from setting.

lib-sieve: Created generic implementation for parsing an envelope_from setting, such as sieve_redirect_envelope_from.
Also adds a new source for the envelope_from address called "postmaster". This means that the value is obtained from the postmaster_address LDA setting.

lib-sieve: script storage: Sieve mailbox attributes use an external storage, so they don't need to be synced explicitly with any mail storage backend.
Patch by Timo Sirainen.

doveadm sieve plugin: Fixed crashes caused by incorrect context allocation in the command implementations.
The base context struct was allocated, rather than the (larger) command-specific context.
Patch by Timo Sirainen.