This option, when added via
  TESTS_ENVIRONMENT = [...] $(top_builddir)/run --test
allows us to run the tests and only print the full output (including
debugging etc) when the test fails.

RHEL 5-era autoconf did not define these, so define them manually
when they are missing.

Define builddir as '.'  The scripts require this.  It won't work
in the srcdir != builddir case, but we don't care about that for
RHEL 5.

This commit also moves the builddir / abs_srcdir variable setting
above the include of subdir-rules.mk, in case that include uses
these variables.

Useful script:

  for f in $(find -name Makefile.am | xargs fgrep '$(abs_srcdir)' -l) ; do
    if ! grep -q '^abs_srcdir' $f; then
      echo missing in $f
    fi
  done

This API makes device names canonical, eg. /dev/vda1 -> /dev/sda1.

Analyze all uses of 'int' in the code, and replace with 'size_t' where
appropriate.

Update all copyright dates to 2012.

Ensure that the drv structure is always zeroed on allocation.

Don't leak old drv->device when add_drives is called multiple times.