The Stacks project

Improvements to section on local rings

Thanks to Daniel Apsley
https://stacks.math.columbia.edu/tag/07BH#comment-8512

LaTeX: \Spec

	Introduced the macro

	\def\Spec{\mathop{\rm Spec}}

	and changed all the occurences of \text{Spec} into \Spec.

Started tags infrastructure

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

More neurotic changes

Clean up labels and references
Add more stringent reference checking to parse.py

	modified:   algebra.tex
	modified:   algebraic.tex
	modified:   categories.tex
	modified:   constructions.tex
	modified:   desirables.tex
	modified:   flat.tex
	modified:   fpqc-descent.tex
	modified:   morphisms.tex
	modified:   schemes.tex
	modified:   scripts/functions.py
	modified:   scripts/make_index.py
	modified:   scripts/parse.py
	modified:   sets.tex
	modified:   sheaves.tex
	modified:   simplicial.tex
	modified:   sites.tex
	modified:   stacks.tex
	modified:   topology.tex

	modified:   Makefile
	modified:   algebra.tex
	modified:   topology.tex

Small bugs in section on spectrum ring

	modified:   Makefile
	modified:   algebra.tex

Small changes continued...