qgit: Annotate hundreds of files at terrific speed ;-)

- pull from git://git.kernel.org/pub/scm/qgit/qgit4.git

- compile + install

- run qgit on the git repo

- select the 900 pounds gorilla called 'Makefile' from tree view ('t'
key shortcut)

- double click on it so to start file viewer and annotation

- say wahooo!

You get _all_ the hundreds (more then 800) of revisions of this monster history annotated in the time it takes *other* ;-) tools to annotate just one of them.

Ok. Come back to earth. I've just pushed some patches to use 'git log' instead of 'git rev-list' as interface with git.

By using git-log with '-p' option it is possible to get a file history _and_ corresponding diff in one pass instead of the double step git-rev-list + git-diff-tree. Speed up it's huge.

But there are other gains:

- qgit can now be run with any command line argument known to 'git log'

- when Linus patch 'git log --follow' will be accepted by Junio the
following of file renames will come automatically

Unfortunately there are issues too:

- git-log lacks currently a --stdin option needed to pass a long list
of sha's, something that a tool sometime wants to do.

- because of the previous issue a StGIT repo under with a long list of
unapplied patches may break 'git log' loading.

- probably 'git log --follow' will come semi-automatically because an
incompatibility with '--parents' option, as pointed out by Linus,
needs a workaround. The latter is currently used to handle the grafts.

Marco