managesieve: Managesieve used "managesieve" rather than "sieve" as login service name, which means that all managesieve-specific settings where ignored.

Nobody does that, but we support it.

When the default was first overriden, then deactivated and finally overriden again, it would erroneously implicitly re-activate.

lib-sieve: storage: Added parameter to sieve_script_delete() to allow ignoring the active status of the script.
Normally, the active script cannot be deleted.
This change is necessary to handle doveadm sieve delete -a correctly when the provided script is the default.

It only worked when sieve_default_name was set.

Caused by earlier sieve_default_name-related changes.

This caused a segfault in the test suite.

Using a location option for the default name makes no sense if its only used for the main personal script.

lib-sieve: storage: Implemented magic to make sieve_default script visible in main storage (e.g. from ManageSieve).

lib-sieve: util: program client: Fixed handing of situation when no input is provided to external program used as a command.
Previous fixes still omitted a few important aspects:
Connect return result wasn't actually passed up to program_client_run().
Default exit code was wrong.

lib-sieve: util: Fixed bug in t_realpath() normalization occuring with relative symlinks below root.
Also contains a few small code cleanups.

LDA Sieve plugin: Changed error handling so that each action log message can have up-to-date time stamps.
This change matches a change in LDA that is aimed at logging timing statistics.

Forgot to adjust a few things when the location types were introduced and documented.