Cleanup of docs.
Merge remote-tracking branch 'mhansen/fq' into trunk

Conflicts:
	doc/latex/flint-manual.tex
Merge remote-tracking branch 'mhansen/fq' into trunk
Update to flint-2.4.
Doc fixes.
Updated NEWS.
Removed some superfluous files.
Fix API changes in examples/fq_poly.c
Typo fix.
Update make dist on 2.4 branch.
Merge remote-tracking branch 'upstream/flint-2.4' into fq