1.4-alpha massive commit:

1.4-alpha massive commit:
- now using a global object $ydb for everything related to DB and other globally needed stuff
- change in DB schema: now storing URLs with their keyword as used in shorturl, allowing for any keyword length
- change in DB schema: new table for storing various options including next_id, dropping table of the same name
- change in DB schema: new table for storing hits (for stats)
- added an upgrader from 1.3 to 1.4
- improved the installer, with .htaccess file creation

git-svn-id: http://yourls.googlecode.com/svn/trunk@103 12232710-3e20-11de-b438-597f59cd7555