Also change the callers to not bother storing it separately. Instead, they
can just use mail_user_r->service_user.

Adds status parameter to sieve_result_execute().

Providing an out-of-range index caused an assert panic.

Panic was:

Panic: file mail-index-transaction-update.c: line 19 (mail_index_transaction_lookup): assertion failed: (seq >= t->first_new_seq && seq <= t->last_new_seq)

testsuite: testsuite-mailstore - Return struct testsuite_mailstore_mail from testsuite_mailstore_open().

This is more flexible and needed in subsequent commit.

This is actually a secondary test. The command calling this should already have
checked this.

It indicates that script execution exceeded a resource limit (currently only CPU
time limit).

Fixes assert failure occurring either at compiletime or at runtime (depending on
whether the value originates from variable).

Reduces code indent.

This indicates whether the last script in the sequence is being executed.

Before, it would only terminate the test when it failed explicitly using the
test_fail command.

The actions contained in the result may keep references to the overriden mail
struct, so these need to be preserved.

The actions contained in the result may keep references to the overriden mail
struct, so these need to be preserved.

This holds a reference to the initial result, causing it to linger after
test_result_reset, thereby also holding a reference to the message context,
preventing it from being cleared. This in turn, can keep references to modified
message versions that cause the main message object to remain referenced. This
causes a panic in specific cases upon test_result_reset:

Panic: Input stream data unexpectedly has references

Caused a panic when input was not valid. This is only relevant to the test suite
and doesn't occur anywhere else (apart from the previous similar commit for
lib-sieve-tool).

Panic was:

Panic in file smtp-address.c: line 684 (smtp_address_write): assertion failed: (smtp_char_is_qpair(*p))`

Use mail_get_message_id() instead of just mail_get_first_header().