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Change slogan

Thanks to Antoine Chambert-Loir
https://stacks.math.columbia.edu/tag/01EA#comment-8014

Slogans by Rogier Brussee

Fix typo in cohomology.tex

Thanks to Fan
http://stacks.math.columbia.edu/tag/01EA#comment-653

LaTeX: Hom and SheafHom

	Introduced the macros

	\def\Hom{\mathop{\rm Hom}\nolimits}
	\def\SheafHom{\mathop{\mathcal{H}\!{\it om}}\nolimits}

	and replaced all the occurences of \text{Hom} and \textit{Hom}
	with these.

Material on the Cech complex of a locally finite covering and
application to computing total direct image of a quasi-coherent sheaf

	modified:   coherent.tex
	modified:   cohomology.tex

Started tags infrastructure

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

Mayer-Vietoris and starting to prove that higher direct images of
quasi-coherent sheaves are quasi-coherent under quasi-compact and
quasi-separated morphisms

	modified:   coherent.tex
	modified:   cohomology.tex