Removed code duplication between testsuite and commandline tools. Also restructured source code of the tools.

Enabled all available mail storage types (those compiled in Dovecot) for the commandline tools and the testsuite.

Merged mail-raw implementations of sieve commandline tools and the testsuite, thus removing duplicate code.

Made lda plugin properly refer to the main script as 'main script' and not the basename of the sieve file (which is of no interest to the user for the main script).

Fixed TODO: made sure main scope used in variables dumping is unreferenced when code dumper is freed.