- Changed operand read functions to prove exec status return codes in stead of boolean.
- Restructured optional-operand, stringlist and string-match APIs to provide execution status (error code) upon failure.
- Corruption errors are only produced when the binary is actually corrupt. Normal failures should never cause a recompile attempt anymore.
- Simplified optional-operand API.
- Cleaned up test command implementations that use the string-match API.

Produce a nicer error message when trying to load with non-lda/lmtp binary (patch by Timo Sirainen).

- Administrators now get properly notified about uncompiled global scripts and the inability of the sieve plugin to store global binaries.
- Improved binary load/save error handling and fixed a few smal bugs.
- Simplified ManageSieve error handling.

ManageSieve/Sieve storag: fixed error handling of PUTSCRIPT commmand; save commit errors would not make the command fail.

Imap4flags: fixed bug in setflag command; when parameter was a stringlist, only the last item was actually set.