ignore artifacts of testing and makemaker
re-enabled ag_background tests

forgot what the exact problem was, but it works now
fixed ag_background tests

They failed when stdin was null, as in OBS or with make -j,
because expect would close stdout(!?). Using `expect_after` after
`spawn` fixes it. This section of `expect_before` documentation
obscurely explains it:

> Unless  overridden  by a -i flag, expect_before patterns match
> against the spawn id defined at the time that the expect_before
> command was executed (not when its pattern is matched).

Also use the working-copy library; a classic mistake.
.changes
Merge pull request #18 from mvidner/test-ag-background

re-enabled tests of ag_background