Item13027: Most try..catch clauses were catching Error::Simple, which is effective only for catching Foswiki-specific exceptions, such as OopsException, which are explicitly derived from Error::Simple. Most errors - and all internal Foswiki error classes, and Error::Simple - derive off Error, so those catches should be catching Error instead. There is virtually no functionality difference between Error and Error::Simple, so long as we are aware that some places may actually want to differentiate Foswiki exceptions from errors. This should reduce the number of stack traces leaking through to the UI.