relax SVN archive

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.

Bug fix for the generic_fns.align_tensor.matrix_angles() function.

Proper IO redirection has been reenabled.