relax SVN archive

Improved the spin data deletion messages from the spin viewer window.

Increased the dialog heights for the deletion of spin data via the spin viewer window.

Improved the user feedback during a state save by just sleeping a little to show the busy cursor.

Modified the spin loading wizard so that preloaded structures are the default.

Fix for the spin loading wizard of the spin window.

The RadioButtons of the first page for selecting the spin loading method are now fixed. With the
new 2.9.3.1 wxPython version, all options were selected. Now using the wx.RB_GROUP style, the first
option is the only one initially selected.

Fix for the about relax window.

On some GTK systems, the font is larger and hence the window will be resized to being bigger than
original hight of 600 px, resulting in the bottom of the window not being rendered.

The maths_fns.relax_fit module is now stored in the dep_check module for the info print out.

Redesigned the spin loading wizard.

Now the starting screen allows the choice of the sequence.read, structure.read_pdb, and
structure.read_xyz user functions. If structural data is already loaded, then the option to use the
pre-loaded structures is also given (which skips to the structure.load_spins user function wizard
page).

Added the structure.read_xyz user function to the menus.

Created the Tools->System Information menu entry, which is simply the sys_info user function front end.