Fixes as posted by Stefan Winter

Fixes as posted by Stefan Winter

just now I have had to upgrade my dialup_admin installation to a machine running PHP5.3, and also noticed numerous PHP errors.

I have fixed the code, see attached patch. It solves the following bugs/deprecated code warnings:

* replace ereg -> preg_match, ereg_replace -> preg_replace, split -> preg_split for PHP5.3 compatibility
* fix LIMIT not working when using MySQL
* add configuration item "timezone" to make PHP 5.1+ happy

and adds one (trivial, one-liner) feature:

* add comparison operators "!=" and "not like" to Accounting

Now, I have an almost error/warning/notice free installation. There is still something bogus around the use of mktime() someplace, but I don't use that part of dialup_admin, so I'll leave that alone.