setup.py: reload __version__.py after writing it.
write_version loads __version__.py before writing it (see 7eb694a1c1af),
so we have to explicitly reload it to use the correct version.
Problem diagnosed by Christian Ebert.
#!/bin/sh
hg init
echo "nothing" > a
hg add a
hg commit -m ancestor -d "1000000 0"
echo "something" > a
hg commit -m branch1 -d "1000000 0"
hg co 0
echo "something else" > a
hg commit -m branch2 -d "1000000 0"
HGMERGE=merge; export HGMERGE
hg merge 1
hg id
egrep -v ">>>|<<<" a
hg status