tests/test-586

convert: save hg revision during a convert

This breaks hg->hg hash roundtripping, but that was fragile, didn't work
reliably, and hence arguably of little value.

#!/bin/sh
# a test for issue586

hg init a
cd a
echo a > a
hg ci -Ama

hg init ../b
cd ../b
echo b > b
hg ci -Amb

hg pull -f ../a
hg merge
hg rm -f a
hg ci -Amc

hg st -A