fts-lucene: Add and use FTS_LUCENE_USER_CONTEXT_REQUIRE Satisfies static analyzers

Updated copyright notices to include the year 2018.

Updated copyright notices to include the year 2017.

global: freshen copyright git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-5]/$1-2016/g;s/ (201[0-5]) Dovecot/ $1-2016 Dovecot/'

fts: Fixed memory leak at deinit when using multiple fts plugins at the same time using libfts.

fts: Fixed infinite looping at deinit. fts_mail_user_deinit() was calling itself. Now the fts backend is responsible for calling it at deinit.

fts: Don't always try to initialize lib-fts. Require backend to explictly do it now.

fts-lucene: Optionally use lib-fts instead of CLucene's own analyzers. fts_lucene = use_libfts enables this.

configure: Stemmer and textcat checks are now done even if CLucene isn't used. They'll be useful for other FTS backends as well. This patch doesn't change any actual functionality.

global: freshen copyright Robomatically: git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-4]/$1-2015/g;s/ (201[0-4]) Dovecot/ $1-2015 Dovecot/' Happy 2015 everyone! Signed-off-by: Phil Carmody <phil@dovecot.fi>

fts-lucene: Added mime_parts parameter to index MIME parts as separate documents. This is in preparation for being able to actually read such information and show it to clients via some new IMAP extension. Also it might be better to index some MIME parts together to avoid wasting disk space, but for now this is all or nothing. For example anything that is "message body" could probably be indexed without the part number at all.

Updated copyright notices to include year 2014.

fts-lucene: Support normalize setting also without snowball. Added no_snowball setting. Snowball seems to be converting / breaking words down rather annoyingly.

Oops :) Update copyrights to 2013 without breaking all .c files.

Updated copyright notices to include year 2013.

Plugin ABI version checking improvements. Previously the plugin version was checked against the version string returned by the currently running Dovecot master process, not necessarily the same as the binary. Also version_ignore=yes setting skipped the version check entirely. Now there's a new DOVECOT_ABI_VERSION macro that can (at least in theory) be updated only when the ABI actually changes. The version is in format "2.2.ABIv1(2.2.15)", where the (2.2.15) would be the actual Dovecot version number that gets ignored when comparing the strings. Also now the plugin version is compared to the actually running binary's ABI, not the master's version, and it can't be ignored with a setting.

fts-lucene: Added "normalize" option to put data through user's normalizer function.

fts-lucene: Added "normalize" option to put data through normalize().

Updated copyright notices to include year 2012.