Format paramfits

Created by: voisey

I've been looking through the paramfits module and I noticed quite a lot of typos and formatting issues. Here I have: (i) fixed typos with the help of a spell checker, (ii) replaced all instances of "pseudorreplica" with "pseudoreplica" (there were also some cases where replica was misspelled), and (iii) removed unnecessary double spaces. Note: I haven't checked whether the code still runs, and I haven't checked whether fix (ii) will cause any issues with backwards compatibility, but hopefully it won't. Also, @Zaharid, please confirm that all instances of "pseudorreplica" were actually typos - I guess an "rreplica" could be a thing...