create two additional remapping weights using cpld_gridgen for use by ocnice prep; deprecate two weights files and regresssion test dependency

[DeniseWorthen]

For #942, two additional remapping weights files are required. These are the weights to remap a field from Ct back to the native stagger locations (Cu, Cv) on a tripole grid. The file to remap from Ct back to Bu for all resolutions was added in PR #922, but the other two files were forgotten. However, the Ct.to.Bu file does not need to be generated for the 1/4 deg case and can be removed.

In addition, two weights files are currently generated for use by the NCL routine previously used to generate ICE initial conditions and are now deprecated. These files were generated only for non-1/4deg cases and required that the regresssion tests for the cpld_gridgen had a dependency on first running the 1/4deg case prior to any other the other cases. For the 1deg case, the files generated were named

tripole.mx025.Ct.to.mx100.Ct.bilinear.nc
tripole.mx025.Ct.to.mx100.Ct.neareststod.nc

and similar names for the other non-1/4deg tripole resolutions (mx050, mx100, mx500).

The cpld_gridgen code needs updating to remove the deprecated weight generation, add the generation of the two new weights and update the rt.sh and rt.conf to remove the dependency on the 1/4deg cases.