New 2.x branch: added additional debug info, email sending limits, legacy email subject, fixed issue #1325938

Fixed errorlog module, switched to core watchdog_severity_levels(), changed error log message format, improved code formatting, moved admin functions to separate inc files

Added formatted watchdog message to email subject. Fixed variable replacement in alert message in email body

Added by bastlynn: Initial commit of watchdog_rules, watchdog_triggers. These modules use hook_watchdog to give site admins additional ways to be notified on events.

Of course, this can be combined with other logging module, such as email log
under the same project, or syslog and dblog in core.

Included is emaillog.
Requires 6.x Drupal post April 10, 2007.