rpm: ha_groonga.so was removed!
rpm: update source URL

We moved to packages.groonga.org from GitHub.
Search libmysqlservices.a directory

TODO: Do the same thing in CMakeLists.txt.

Reported by Y.Kentaro. Thanks!!!
Fix a bug that Mroonga_log_level variable value can't be set in my.cnf

[groonga-dev,01379]

Reported by Kazuhiro Isobe. Thanks!!!
Remove explicit NULL check by "!= NULL"

We always use "if (object)" style NULL check in condition.
cmake: fix DBUG_OFF option is overridden
test: drop references table then referenced table

It is limitation. Users should take care about it.
Fix a memory leak
Accept free style normal comment in table comment

https://gist.github.com/y-ken/4b26ca95081b6706ac73

Suggested by Y.Kentaro. Thanks!!!
storage test: group "normal" column
Accept free style normal comment in index comment

https://gist.github.com/y-ken/4b26ca95081b6706ac73

Suggested by Y.Kentaro. Thanks!!!
wrapper test: group "normal" column
test: "not_for_mroonga" for normal comment
Extract codes that create an expression
Extract codes that parse "D" pragma
Simplify condition
Unify simple conditions
Support "W" pragma

"W" pragma exists in Tritonn: http://qwik.jp/senna/query.html

It can apply weights for each section in multiple column index.
It also supports that removing a section from search targets.

TODO:
- add more tests.
- document.
test: don't use --parallel=n on debug
Require groonga >= 3.0.4

It is for "W" pragma.