relax SVN archive

Big simplification by shifting the widths of the text selection GUI element to hard coded variables.

These hard coded class variables are located in the base class.

Modifying the function test 'test_read_xyz_internal1()'.

This is Han's patch https://gna.org/task/download.php?file_id=13144 attached to the task
http://gna.org/task/?7404.

The function 'test_read_xyz_internal1()' was modified so that it is more specific to the XYZ file
added to relax and for the new XYZ reader.

A spacer is now used for add_text_sel_element() if no button is present to fill the button space.

The model-free, Rx, and NOE frame main box sizers all expand horizontally now.

The text controls are now horizontally expandable.

Creation of a new system test test_read_xyz_internal1().

This is Han's patch http://gna.org/task/download.php?file_id=13143 attached to the task
http://gna.org/task/?7404.

In order to create a system test for reading the xyz file, a new function
'test_read_xyz_internal1()' has been generated in the xyz/test_suite/system_tests/structure.py. It
is based on the function 'test_read_pdb_internal1()'.

Added a hard coded variable for the size of the graphical part of the analysis frames.

Simplified and localised a variable.

Both SetSize() and SetMinSize() are now used for the main GUI window.

This allows for a proper layout.

Changed the Frame.SetSize() call to SetMinSize() to prevent the main GUI window becoming too small.