Fixed bug in configure script that emitted Dovecot version in config header in stead of Sieve version.

Enabled (optional) support for Valgrind in the testsuite and fixed a few intricate bugs in the process.

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

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

Created skeletons for regex and relational extensions. These are to be developed simultaneously with the match-type support in general.

* Added plugins as static libraries (for now)