The Stacks project

Invisible changes

pell check: words starting with n, o, p, q, r, N, O, P, Q, or R

Chech complexes of unbounded complexes

This is a bit lame... and proofs still need to be added or fleshed out.

Fix signs in section on Cech cohomology of complexes

	The Cech complex of a complex of abelian sheaves F^* has terms

		C^p(U, F^q)

	and p is the first index. Hence the differential, according to
	our general conventions should be

		Cech differential + sign * differential of F^*

	This simplifies many of the calculations. We also added a script
	which checks the signs for the cup-product.

Fix references and labels

	Necessary because of addition of new chapter in previous commit.

Started tags infrastructure

	new file:   scripts/add_tags.py
	modified:   scripts/functions.py
	new file:   tags/initial_tags
	new file:   tags/tags

More cohomology with hopefully more correct version of the functoriality
discussion. Argh!

	modified:   cohomology.tex
	modified:   sheaves.tex
	modified:   topology.tex