#14 rule_combine and bzip2 format

[Dirk Datzert]

Hi Jason,

working with MD5 sum on gzip files will change the MD5
sum für each new gzip-file created from an unchanged
tar-file !

If you build the MD5 sum on bzip2 files created from a
unchanged tar-file the MD5 sum won't change.

Selecting bzip2 format for rule-upload in snortcenter
would better fit the MD5 sum check function.

Only db_pars.php and rule_combine are affected on this
improvement.

Best Regards,
Dirk

[Dirk Datzert]