return value/error check audit

[dmorton]

We need to do an audit and check all mysql calls for return values and display an appropriate error page on error, and report the more usefull part of the error in log files or email.

[rjl]

Bear 17 in mind as well. Centralize query execution, e.g. with a maia_db_query() function rather than calling PEAR::DB methods directly. This provides a clean mechanism for logging taps as well as checks for connection failures and handling failover.

[rjl]

Er, make that 32, sorry :)