Teach convert-repo about tags
Git tags are bad, very bad. More importantly, they're horribly
inconsistent. This drops tags which don't appear to work like most of
the others.
manifest hash: f2dda9e9a3ae8a0d84b19e496059b8a795b8e603
#!/bin/sh
set -x
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -t "test" -u test -d "0 0"
hg history
hg manifest
hg cat a
hg verify