relax SVN archive

Added the user function interface for setting the spectrometer frequency of an experiment.

Made the experimental id string compulsory.

Completed the generic_fns.temperature.set() function.

Allowed the temperature to be entered as a integer as well as a float.

Fixed the setting up of the temperature user function.

Added a stub function generic_fns.temperature.set() to fix the missing import problem.

Activated the temperature user function interface.

Added the user function interface for setting the experimental temperature.

The Monte Carlo error_analysis() function now uses the unimplemented specific model_loop() method.

Renamed the 'clean_temp' and 'clean' scons targets to 'clean' and 'clean_all' respectively.