About to introduce gift layer in born.
Merge pull request #7 from johncburnham/master

Changes suggested by Bruce Schwartz
Intermediate state of born reconstruction.
Checking in new shell.
Merge branch 'master' of github.com:cgyarvin/urbit
Almost ready to switch to new shell.
New born compiles.
Old new born before remove.
Smoketest of new born.
Basic prompt functionality.
New inclusion syntax.  Breaks everything nontrivial.
Name change.  :hi works again.
Various fixes and improvements.
This shouldn't be checked in...
Hunt-McIlroy diff and a bunch of other stuffz.
Diff jet now activated.
Don't check in -g.
Checkpointing with a few glitches.
Some dill improvements.
Diff jet bugs finally quelled.