The Stacks project

Small typo

Thanks to Takagi Benseki
https://stacks.math.columbia.edu/tag/0175#comment-8516

Started tags infrastructure

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

Changed the index to at least have an alphabetized list of terms defined
in the project. Thanks Cathy!

	modified:   algebra.tex
	modified:   categories.tex
	modified:   constructions.tex
	modified:   exercises.tex
	modified:   fpqc-descent.tex
	modified:   groupoids.tex
	modified:   homology.tex
	modified:   hypercovering.tex
	modified:   modules.tex
	modified:   morphisms.tex
	modified:   properties.tex
	modified:   schemes.tex
	modified:   scripts/functions.py
	modified:   scripts/make_index.py
	modified:   sheaves.tex
	modified:   simplicial.tex
	modified:   sites.tex
	modified:   spaces.tex
	modified:   topology.tex

More neurotic changes

Moved all the stuff about simplicial objects into its own file.

Small about of stuff on hypercoverings