relax SVN archive

Simplified the non-keyword argument test of the minimise() user function.

Nested looping is not necessary to test all combinations.

Bug fix for the minimise() user function.

All arguments are now checked if they are strings.

Wrote a unit test for the arguments to the minimise() user function.

This is for the variable argument list for the minimisation algorithm and its options.

Added string tuples as a new data type for the user function argument unit tests.

Wrote 5 unit tests for the arguments of the minimise.grid_search() user function.

Wrote the print_flag arg unit test of the minimise.calc() user function.

Created the base class for the unit tests of the prompt and generic_fns minimisation functions.

Converted all of the minimise user functions to the new relax design.

Improved the print out for the calculation of 5D angles.

Added a missing import statement.