* improved script loader language support

* improved script loader language support
** supports url language code parameter
* improved performance on cached hit ( apache bench mark goes from
old: Rps:   23.40 [#/sec]
new: Rps:  378.61 [#/sec]
** we don't check existence of wiki title until after cache file check.
** we don't load all includes/WebStart.php before checking cache

* some remote search bug

** improved speed and accuracy of language swapping ( token check no breakage with }) in msg text limitation
* improved core js2 performance in parsing class defines from mv_embed.js
** only reads 8k of head at a time.
* reduced expire time to one day (instead of one year on script requests)
* removed $wgEnableScriptMinify (just use debug or ?debug instead)