relax SVN archive

Created the interfaces for the PCS user functions.

Spelling fix in the docstrings.

Renamed ave_pcs_tensor_ddelta_ij_dAmn() to ave_pcs_tensor_ddeltaij_dAmn() for consistency.

Import fix.

Set up the rdc and pcs flags in the __init__() method.

Modified the dfunc_population() gradient function to handle both RDCs and PCSs.

Modified the func_population() target function to handle both RDCs and PCSs.

Spelling fix in the docstrings.

Pseudocontact shifts are supported by the N_state_opt.__init__() method.

The target functions still need to be updated.

Deletion of an ancient branch which was merged into the 1.3 line at r2910 (on 2006-12-02).