Update enum encoding to latest spec.

BUG=
R=floitsch@google.com

Review URL: https://codereview.chromium.org//718703002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41685 260f80e4-7a28-3924-810f-c04153c831b5
Recovered \LM.. commands

Recovered the \LM.. commands inserted in order to support SHA1 hash value
markers on spec paragraphs; also recovered a couple of changes directly
required for the \LM.. commands to work.

Review URL: https://codereview.chromium.org//722573003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41686 260f80e4-7a28-3924-810f-c04153c831b5
Working insertion of hash values; added a few labels in spec

Hash values are now computed for each "paragraph" starting with \LMHash
(which includes subsequent grammar, dartCode, itemize blocks, but stops
at \section-like commands).  Now addlatexhash.dart expects three arguments
(first the source latex file, then the destination simplified and
hash-value-annotated latex source file, and finally a file name used to
create the list of hash values emitted).  Adjusted testing accordingly.
Added a test for robustness of the hash value generation: It is checked
that lots of different "unimportant" changes make no difference for the
generated hash values (e.g., we can add/remove comments, change white
space, add \commentary{..} etc. without changing the hash values).

In order to ensure that all "structure" commands in the spec have a label,
I added an \LMLabel{..} a handful of places, following the style which is
used throughout the spec.

In dart.sty, the \renewcommand that made \LMHash{} produce a fixed
hash value has been removed such that the actual hash values are now
inserted into the generated spec PDF/DVI file.  Tests have been adjusted
to handle this difference between the spec with and without hash values
when comparing the two.

R=gbracha@google.com, lrn@google.com, ricow@google.com

Committed: https://code.google.com/p/dart/source/detail?r=41658

Reverted: https://code.google.com/p/dart/source/detail?r=41662

Review URL: https://codereview.chromium.org//652993005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41687 260f80e4-7a28-3924-810f-c04153c831b5