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Molecular dynamics by NMR data analysis

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Renaming of the 'dx' user function class to 'mapping'.

In addition, the dx.map user function is now called mapping.setup and the dx.execute user function
is now mapping.dx_execute.

Authored by: bugman 2014-10-14

changed	/branches/space_mapping_refactor/user_functions/__init__.py
renamed	/branches/space_mapping_refactor/user_functions/dx.py -> /branches/space_mapping_refactor/user_functions/mapping.py

File was renamed.