relax SVN archive

Changed the colour of the icon to match relax' blues.

Modified refresh_peak_list_display() to update the relaxation times as well.

Rewrote refresh_r1_1() into the new empty_list() method.

This simply resets the relax data store variables and calls refresh_peak_list_display().

Fix for peak_list_add_action().

The check for the list being full was not working.

Complete rewrite of the add_r1_1() method, now called peak_list_add_action().

This includes:
- The proper support for multiple file selections.
- Checks for too many peak lists.
- A new method called count_peak_lists() added.
- The refresh_peak_list_display() method written to update the GUI element at any time.

Updated the multi_openfile() function.

The args were turned into keyword args, the function comments converted to a docstring, many comments
added, whitespace fixes, and dialog.GetPaths() is now used to return a list of files.

Created the gui_bieri.message.error_message() function for displaying general errors.

Converted the peak list button from text to bitmaps.

Imported the 48x48 icons.

Shifted the peak list button sizes into one local variable, 'size_button'.