db: record which system a particular build was for.
the biggest side-effect of this change is the database schema must change in a way that
sqlite will not let happen without rebuilding the database. (Hence take this
opportunity to rename git_revision to scm_revision.)
cran2deb essentially behaves as if it cannot see any builds for any system
other than the currently configured one.
Also: note some changes in the documentation. One bit just has a fat warning as
I am feeling lazy. Sorry.
git-svn-id: svn://svn.r-forge.r-project.org/svnroot/cran2deb@158
edb9625f-4e0d-4859-8d74-
9fd3b1da38cb