relax SVN archive

Implemented the reading of chemical shifts in the lib.spectrum.nmrview.read_list() function.

Created the Chemical_shift.test_read_nmrview system test.

This, if not obvious from the name, is for checking the reading of chemical shifts from an NMRView
peak list.

Implemented the reading of chemical shifts in the lib.spectrum.xeasy.read_list() function.

Created the Chemical_shift.test_read_xeasy system test.

This is for checking the reading of chemical shifts from a 2D XEasy peak list.

The lib.spectrum.sparky.read_list() function can now auto-detect the peak volume column and use it for intensities.

Expanded the functionality of the lib.spectrum.sparky.read_list() function.

Now the dimensionality of the peak list is automatically determined, and all peak lists from 1D to
4D are supported. The chemical shifts are also automatically detected and extracted from the list
and placed into the peak list object. The peak intensity data is also automatically detected,
therefore the int_col argument is no longer used.

Fix for the proton name in the new Chemical_shift.test_read_sparky system test.

Missing imports for the new pipe_control.chemical_shift module.

Modified the peak list object.

The peak list dimensionality variable is no longer private, and many values of None are now
converted to lists of None so that the peak list data is easier to handle.

Renamed all of read_*() functions of the lib.spectrum modules for consistency.

These functions will now be used to read all types of data from a peak list, from the assignments
to chemical shifts to peak intensites, and everything in between.