relax SVN archive

Renamed relax_fit.read() to relax_fit.relax_time() and significantly decreased its functionality.

Most of relax_fit.read() is now in spectrum.read_intensities() and hence this functionality has been
axed. All that is left is the associating of a spectrum to a time point.

Fix for the user function class documentation.

Wrote the int_method arg unit test of the spectrum.read_intensities() user function.

Added the int_method arg to the spectrum.read_intensities() user function.

Fixes for the arg unit tests of the spectrum.baseplane_rmsd() user function.

Fix for 2 arg unit tests of the spectrum.integration_points() user function.

Fix for the N arg check of the spectrum.integration_points() user function.

Wrote 3 arg unit tests for the spectrum.integration_points() user function.

Created the spectrum.integration_points() user function interface.

Renamed spectrum.error() to spectrum.baseplane_rmsd().