Why do we have the FRAME_TRANSFORMATIONS macro in defs.hpp?

[felker]

Doesn't seem to be used anywhere @c-white, since the -t works by selecting a rsolver/ file to compile. Should we keep it?

[c-white]

This must be a remnant of an old way of doing things. We can get rid of it.

This reminds me -- since I was the first one to add extended physics to the code, I sort of hogged lots of single-character configuration flags. We might want to consider expanding -s, -g, and -t to more meaningful strings, perhaps -sr, -gr, and -gr_trans.

[felker]

-sr,-gr do seem better, but not sure if it is worth breaking backwards compatibility with peoples' driver scripts.

-ft? -frame_transform?

[c-white]

Both -ft and -frame_transform would work, but I'm also not sure how much to worry about compatibility.