In effect, this adds PIE and RELRO to binaries.

- Now compiles regularly without --with-unfinished-features
- Still experimental though, so be careful.
- Changed command structure a bit, removing the useless -M option.

Made vnd.dovecot.debug extension available to the LDA plugin instead of only the command line tools.

Changed result execution logging to use a var_expand_table created by liblda to avoid code duplication (patch by Timo Sirainen).

Let configure automatically infer path to installed Dovecot and don't rely on installed libtool .la files anymore (patch by Timo Sirainen).

Removed the sieve-filter tool from the default build. Need to specify --with-unfinished-features to get this tool built.

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.

Almost finished implementing the store action. But, I still get strange errors when the mail transaction commits. Mail is stored though.

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