Fix git-regression-build so that output is copied to build-log file

Use git clean in regression build to get rid of more stuff

build cleanAll is all very well, but it may miss things, and I do want
to test the build from a clean state.

Fix regression test script for changes to build c/line options

Attempt to make regression test shell-script a bit more robust.

Pass parameters within regression-build so that selftest levels work

Attempt to make regression tests fail gracefully if they overlap.

Put selftest information into regression test message subject lines.

Allow -otknl as a kernel spec in git-regression-build.sh

Update regression build script to dump output of failed git pull

Use explicit log --pretty formats to better control output.

This gets around use of full 40 character SHA-1 hashes on git 1.5

Fix git-regression-build for older versions of git.

The --oneline option to log has to be --pretty=oneline for git 1.5.

Slight recasting of regression build shell script.

Previous version may have given me an odd looking shell syntax error.
This version ran successfully.

Update git-regression-build script now that we're on 'pure git'.

Added git version of regression-build.sh

For use in a git-svn clone of the HOL repo.