relax SVN archive

Fixed the behaviour of the number of cycles column in the Rx tab grid.

Deleting or not entering a number was causing '1' to appear in the cell!

Better spacing of the Rx tab elements.

Implemented the delay time TextCtrl and added the number of cycles column to the Rx peak list grid.

This implements what was discussed in https://mail.gna.org/public/relax-devel/2011-06/msg00036.html
(Message-id: <BANLkTi=8v-S=rO4NBcFVrxHorWaq34J5Jw@...>).

This is a big change. The changing of the number of cycles values or the delay time automatically
updates the relaxation times. These times are now read only cells. And the +, +VD, and +VC buttons
are gone as they are no longer needed.

relax icon is not shown in "Global relax settings" window if running on a Mac.

This is as in revision 12856:
http://svn.gna.org/viewcvs/relax?rev=12856&view=rev),
but for the button "Settings" / "Global relax settings".

This change creates a bug, as the opened window upon clicking this button,
when closed, will have relax gui crash (with no button responding). This
needs to be fixed...

On the download page, added some instructions for the installation of wxPython under Mac OSX.

Abstracted the grid GUI element by renaming self.peaklist to self.grid.

Renamed peak_list_header() to add_header().

Shifted the grid construction code into the add_grid() method.

Shifted the button code into the add_buttons() method.

Fixed an alignment.