minirst: convert ``foo`` into "foo" upon display
This lets us markup many more occurances of inline literals since they
no longer look strange in the terminal output.
#!/bin/sh
hg init a
cd a
mkdir a
echo a > a/b
hg ci -Am m
hg rm a
hg ci -m m a
mkdir a b
echo a > a/b
hg ci -Am m
hg rm a
cd b
# relative delete
hg ci -m m ../a