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.
