relax SVN archive

Bug fixes and completion of the NOE data analysis section of the manual.

The grace file produced by grace.write() has had one bug removed (not \n). The point are now small
circles instead of crosses.

The NOE functions return_conversion_factor, return_grace_string, and return_units have been added
to the specific_fns/specific_setup.py file.

Added a chapter to the manual about data analysis. This is a chapter intended to explain
step-by-step how to implement the data analysis chain in calculating the NOE, fitting the R1 and R2
relaxation curves, implementing reduced spectral density mapping, and doing model-free analysis.

Also added an introduction paragraph to the maths chapter to warn ordinary users to not read it.

A large number of changes in preparation for optimisation of the exponential relaxation curves.

The user function 'relax_fit.curve_type' has been renamed to 'relax_fit.select_model' to bring it
into line with the model-free functions.

Bug fix: The model-free prompt function now prints the 'res_num' argument.

The following functions have been added to the file 'specific_fns/relax_fit.py' in preparation:

self.assemble_param_vector()
self.data_names()
self.grid_search_setup()
self.linear_constraints()
self.minimise()
self.model_setup()

A few other fixes have been added to 'specific_fns/relax_fit.py'.

The 'data_init' function of 'specific_fns/model_free.py' has been simplified a little.

The relax_fit minimise function has been added to 'specific_fns/specific_setup.py'.

More additions to the relaxation curve fitting functions.

The specification of the exponential curve type, either the two parameter standard experiment or
three parameter inversion recovery experiment has been shifted out of the function
'relax_fit.read()' into it's own function 'relax_fit.curve_type()'.

A grid search function has been added.

The specific setup has been modified to printout information when the debugging flag is given to the
program and when no specific function can be found.

Added the relaxation data curvefitting function 'assign_function' for placing the data into
'self.relax.data'.

Bug fix:

Chris MacRaild found a bug in the program where back calculation of relaxation data would fail on
unselected resides. I've added the fix he suggested.

Bug fix:

Fixed a problem with the capitalisation of internal model-free parameter names.

Spell check of the Dasha user function docstring.

Fixed a problem in the maths section of the manual.

Updated the manual.