relax SVN archive

This includes the deletion of the relax_data.frq user function as this replicates the behaviour of
spectrometer.frequency. A number of functions from the pipe_control.relax_data module have changed:

- frq() has been deleted as it is replaced by pipe_control.spectrometer.set_frequencies(),
- frq_checks() has been shifted to pipe_control.spectrometer.frequency_checks(),
- frq_loop() has been shifted to pipe_control.spectrometer.loop_frequencies(),
- num_frq() has been deleted as the new variable cdp.spectrometer_frq_count contains this info.

Two new functions in the pipe_control.spectrometer module have been added to remove the
functionality from pipe_control.relax_data. These are copy_frequencies() and delete_frequencies().