Made the minimal length of the search query configurable
Made the minimal length of the search query configurable

e.g. for Trac installations using mainly the Corean language, where most words are made of 2 characters:
{{{
[search]
min_query_length = 2
}}}

Closes #3264.


git-svn-id: eda3d06fcef731589ace1b284159cead3416df9b@3415 af82e41b-90c4-0310-8c96-b1721e28e2e2

jun66j5/trac-ja,netjunki/trac-Pygit2,netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac,walty8/trac,jun66j5/trac-ja,walty8/trac,netjunki/trac-Pygit2,jun66j5/trac-ja,walty8/trac