Update "exact expt"

[jpellegrini]

@lassik do you think it would be OK to focus on more modern implementations? And are the list of removed ones really not being maintained anymore?

• Remove some of the very old systems, which probably nobody will be using anymore

• The page listed only tests with exact rational base. Now we include a test with exact rational exponent, which is very interesting.

[jcubic]

LIPS in meantime fixed expt and (expt 81 1/4) now return exact 3.

[jpellegrini]

LIPS in meantime fixed expt and (expt 81 1/4) now return exact 3.

Yes - fixed!

[lassik]

@lassik do you think it would be OK to focus on more modern implementations? And are the list of removed ones really not being maintained anymore?

• Remove some of the very old systems, which probably nobody will be using anymore

I think we should not remove information that has already been gathered (especially if that work has been done by other people). If info about old Schemes makes the tables hard to read, perhaps we should make separate tables for them.

[lassik]

(Some background: About every month in #scheme, someone comes up and says "let's just get rid of all except these N implementations", where N = 3, 5, 10, ... It you get these people together, everyone has a different opinion of which N. These people essentially believe that Scheme should be a copy of some popular language, and that their use cases are the only valid use cases.)