[PATCH 0/8 REVISION2] work-tree cleanups

Hi,

the patch series I sent was almost as bogus as the original work-tree 
patch series.  However, thanks to the comments, and a night's sleep, here 
comes a revised patch series which is not only readable (it was readable 
before, too), but which actually works as expected.

Not only does it pass the tests, but it also adds some tests of its own.

And yes, you can "GIT_DIR=/some/where git add <file>..." now.  Even if you 
are not at your working tree's root.

Ciao,
Dscho