Have "bup get" print directory names for one -v, and all paths for two.

Thanks to Karl Kiniger <karl.kiniger@med.ge.com> for noting that
we might want --verbose to be a little more effusive.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Makefile: run t/test-get.sh.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Fix "bup get -t ...", and add tests for -t and -c.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
get-cmd.py: fix broken commit content (add "author" prefix to author line).

This problem was exposed when attempting to switch to use author dates
instead of commit dates for the saves.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Use the author date, not committer date for the bup save date.

Since "bup get" changes the committer date for fetched commits to
match the current date, use the author date to represent saves so that
fetched saves will have the same names as the originals.

This should have no effect with respect to backward compatibility
because until now, bup always used the same date for the author and
committer.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>