Extrae analysis could be sped up

[ptooley]

Paramedir does support multiple config files at once, which would improve processing speed, but it would require some pre-testing of the prv file to check what events are present. This is entirely feasible but needs a rewrite of the PRVloader to build the correct list of configs to use based on the events in the prv file and to gracefully handle failure in some way.

Need to see how paramedir handles failures in multi-config mode and then work out what can be done.