The Stacks project

Fix notation and typo

The symbol M denotes both a diagram (in the statement) and a limit (in proof).
I have changed the latter.

Change definition of connected: require nonempty

Thanks to Burt Totaro

LaTeX: Remove useless brackets

LaTeX: \Mor

	Introduced a macro

	\def\Mor{\mathop{\rm Mor}\nolimits}

	and replaced all the occurences of \text{Mor} with \Mor.

First macro of the project

	This gets rid of all the \nolimits commands following \lim by
	defining

	\def\lim{\mathop{\rm lim}\nolimits}

	in the file preamble.tex. As far as I can tell this is
	equivalent to \lim\nolimits where \lim is the internal command
	of TeX. The dvi files produced before and after this commit are
	identical.

LaTeX: fix lim

	Replaced all the occurences of \text{lim} by \lim or
	\lim\nolimits depending on whether the invocation occured in
	display math or not.

Smorgasbord of changes

	Loose ends:
		algebra: add colimit over almost directed cats
		sites-modules: exactness of g_!
		more-morphisms: exactness of g_!
		spaces-morphisms: closed immersions and sheaves
		spaces-more-morphisms: conormal sheaves
	should be fixed up soon

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

Starting with acyclicity...