relax SVN archive

Implemented the replicated() function.

Fixes for the relax_fit.py sample script.

This includes fixes for spectrum.read_intensities() and the use of spectrum.replicated().

The duplicated spectra are now specified in the relax_fit.py system test script.

Fixes for all the peak list reading tests.

The int_method arg to spectrum.read_intensities() was incorrectly set to 'heights'.

Removed some debugging code.

Fix for the relax_fit.py system test script.

The spectrum.read_intensities() user function arg int_method was incorrectly set.

Added a check for the value of int_method in the spectrum.read_intensities() user function.

Modified the NOE calculation code for the new spectra setup.

Wrote the NOE spectrum_type() method.

Split up the error_analysis() function.

The two functions __errors_height_no_repl() and __errors_volume_no_repl() have been created. The
other 4 analysis types will be added as functions later.