Fix typo

Thanks to Fred Rohrer
http://stacks.math.columbia.edu/tag/0912#comment-233
Fix for xyjax error on Tag 089G

The fix is to make sure there is no &\Spec in xymatrix
However, having this doesn't trigger the bug consistently.

Anyway, the easiest solution for now is to make sure every
& is followed by a space in the LaTeX files.
Remove % occurring in middle of a line

Reason: it breaks parsing of the LaTeX in the website

We can later go over these and see if we can cleverly shorten them to
stay within the 80 character limit, or we can teach parse.py about the
exceptions:
\begin{list}
\rtwocell and variants
\frac
\href
Another long line
Tag: 051M, details omitted

Thanks to Florian Lengyel
Changes in response to comments on website

Thanks to Keenan Kidwell and Daniel Miller
http://stacks.math.columbia.edu/tag/00T6#comment-235
http://stacks.math.columbia.edu/tag/03NQ#comment-236
http://stacks.math.columbia.edu/tag/03PA#comment-237
Mostly typos

Thanks to Albert Gunawan
Fix basic item

Thanks to 'y'
http://stacks.math.columbia.edu/tag/00AR#comment-245
The dimension of the empty space is - infinity

This is compatible with the definition in Bourbaki
Depth of the zero module is - infinity

Discussed here http://math.columbia.edu/~dejong/wordpress/?p=3372
Clean up section about Noetherian local rings
Two typos
Remove MRCLASS, MRNUMBER, MRREVIEWER from bib file
Comparison Illusie's L with Lichtenbaum-Schlessinger's L

This is a bit sketchy, but clearly correct.
Comparing types of regular sequences + Tags: added new tags
Improvement proof of agreement with Lichtenbaum-Schlessinger

Quite satisfying since now we do not need to use Quillen's spectral
sequence to see that the result holds.
Lemma Tag 00QR was false!

Pointed out by Roland Paulin
http://stacks.math.columbia.edu/tag/00QR#comment-251

Todo: fix applications of erroneous lemma
Fix use of erroneous lemma
Fixed three website issues in the bibliography

The macros \sb and \sp are too obscure for our situation.
Merge branch 'master' of github.com:stacks/stacks-project