MDL-26425 tablelib clean up setup and URL handling code.
MDL-26425 tablelib clean up setup and URL handling code.

Note that this change removes ->reseturl, This was supposed to be a way to reset all the session stuff relating to a table automatically in some situations, but from using Moodle and reading the code, I don't beleive it was working. The code was horrible and not easily fixible, and has been broken for years, so I just removed it.

dilawar/moodle