Rewrote the general results section

Highlights:

* Tried to improve the name of the section. Renamed to "Cycles of
  quadratic maps and their Galois conjugates";
* Improved (hopefully) statement of the theorem and conjecture.
* Now using Z/NZ for indices instead of Z; proof cleaned up accordingly.
* Adjusted transitions according to global re-ordering.

Search for %!! in the source code for to-do items.
ignore ijnt/ directory

I've been planning ijnt submission, but ignoring the directory for now
to focus on semantic edits.