Add unittests

update DB Schema class

use isset to prevent undefined index

adding executable script occ (ownCloud console)

Unittests for:

- search/result

- util

- preferences

adding new cli script to rescan files

make log date configurable, default to iso 8601

Port log level filtering from OC_Log_Owncloud to OC_Log_Syslog.

app migrate: Use = instead of LIKE as described in the comment above.

Simplify OC_DB transaction functions

Add ocimage unittest

Make default language configurable via config.php

add OC.Breadcrumb.show(dir, filename, link)