relax SVN archive

Polishing of the free file format GUI element.

The internal buttons are now placed to the right hand side rather than below to save large amounts
of space. A lot of unnecessary outside padding has also been removed, and the divider position is
now properly calculated.

Updates to the fonts, and the addition of normal_italic.

Improvements to the wildcards for the relax save state file dialogs.

There is now a separation between the compressed *.bz2 *.gz files and the 'All files' entry for
selecting an uncompressed version.

The protected_exec() function now uses gui_raise() to handle errors.

The gui_raise() function now prints the error message to stderr if the raise flag is not set.

Removed an empty line.

Redesign of all the file dialogs in the GUI.

All file dialogs are now instances of gui.filedialog.RelaxFileDialog. This fixes many
inconsistencies throughout the GUI, includes presenting an wx.FD_OPEN style file dialog when a
wx.FD_SAVE style should have been shown.

The PDB file selector of structure.load_pdb now only shows *.pdb files.

Reverted r13986 as this was causing the main window to be poorly placed on screen on Mac OS X.

The command used was:
svn merge -r13986:13985 .

The main window SetSize method is no longer called as the wx.MAXIMIZE style is set.