patchbomb: fix From_ in the message's envelope
Localized date in the From_ prevents MUAs like mutt from parsing mbox files
generated by patchbomb. Using a 24 characters date in asctime format instead.
#!/bin/sh
mkdir a
cd a
hg init
echo foo > b
hg add b
hg ci -m "b" -d "1000000 0"
chmod -w .hg/store
cd ..
hg clone a b
chmod +w a/.hg/store # let test clean up
cd b
hg verify