The Stacks project

Started tags infrastructure

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

Start to begin more serious stuff on topologies and algebraic spaces

	modified:   Makefile
	modified:   chapters.tex
	modified:   etale.tex
	new file:   fpqc-descent.tex
	modified:   preamble.tex
	modified:   spaces.tex
	modified:   stacks-git.htm
	new file:   topologies.tex

Introduced big/small/affine Zariski/fppf sites

	modified:   etale.tex
	modified:   sets.tex

More stuff added

	modified:   algebra.tex
	modified:   etale.tex
	modified:   morphisms.tex
	modified:   my.bib
	modified:   properties.tex
	modified:   schemes.tex
	modified:   sets.tex
	modified:   topology.tex