Complete conversion from t[12x] and T[12x] notation to r[12x] and R[12x].
This corresponds to one component of the patch_II file attached to https://gna.org/task/?6847 by
Michael Bieri (https://gna.org/users/michaelbieri). This change was discussed in the tread starting
at https://mail.gna.org/public/relax-devel/2010-01/msg00007.html.
These changes are far more extensive than that in patch_II, and cover 100% of the code.