This was quite fundamentally broken, not only due to previous change.

lib-sieve: file storage: Fixed bug that caused missing active symlink to cause a temporary error in some cases.

A conditional expression was inverted, causing the path to remain unnormalized.

Messed up the previous attempt.

The error status code wasn't set, so this was handled as an error rather than a warning in the LDA plugin.

lib-sieve: file storage: Improved backwards compatibility with respect to the active script being a regular file.

This is particularly important when the location is recorded in the binary for checking whether it is up-to-date.

lib-sieve: editheader extension: Made protection against addition and deletion of headers configurable separately.
Also, the received and auto-submitted headers are now only protected against deletion as required in the RFC.
Updated the documentation accordingly.

Currently cannot freely assing server metadata items for testing.
Disabled tests for now.