Improve error message when parameter file is not found

[Erik Schnetter]

I specified a wrong path "par/recover.par" for a parameter file, and Simfactory didn't find the parameter file. Simfactory's error message was:

Error: specified parfile /project/numrel/eschnett/philip/EinsteinToolkit-hg/simfactory/etc/parfiles/par/recover.par does not exist or is not readable

This is confusing, since the parameter file was not in the "parfiles" directory of Simfactory. Simfactory should list all the places where it looked for a parameter file, and should also output what the user actually specified.

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