relax SVN archive

Missing import.

Changed the open_file() method to only change variables in its own class.

Renamed the StructureTextCtrl method structure_pdb() to open_file().

All PDB file inputs now use StructureTextCtrl.

Converted the structure_pdb() method into a method of a new class derived from wx.TextCtrl.

The new derived classes module will have wx classes modified for use in the relax GUI.

Deleted the __set_properties() method and shifted the frame font size property into __init__().

Deleted the now unused __do_layout() method.

A few unused sizers were inside this method.

Shifted a property into add_relax_data_input() that had not been already moved.

Spun out the rest of the automatic model-free analysis code out into methods.

The new methods include:
add_execute_relax()
add_mf_models()
add_modsel_method()
add_pdb_selection()
add_results_dir()
add_unresolved_spins()

Shifted a few variable of add_relax_data_input() back into the class namespace.

This allows the methods bound to the buttons to function.