relax SVN archive

Fixes for pack_data() to allow the errors to be a numpy array.

The relaxation values and errors from the BMRB file are being converted from ms to s now.

Removed a debugging print out.

The optimisation of Monte Carlo simulations no longer changes the Q factors and back calculated data.

There was a bug in which the back calculated RDCs and PCSs, as well as the Q factors were being
calculated for each Monte Carlo simulation but stored in the non-MC sim data structures. Therefore
after MC sims, the Q factor and back calculated data would be that of the last simulation!!!

Added checks showing that Monte Carlo simulations in the N-state model modify the Q factors.

Fix for the calls to RelaxError in the N-state model return_error() method.

Fix for the N-state model error returning method for when errors are not present.

The spin_id variable was not defined.

Fix for the sample label matching - this is only performed if the sample label is given.

The sample conditions label is now being used to select the correct BMRB saveframes to read.

Removed the unused index.html.