tests/test-debugrename

doc/hgrc.5.txt: add anchors for sections

Enables links into hgrc.5.html of the form: hgrc.5.html#section

#!/bin/sh

hg init
echo a > a
hg ci -Am t

hg mv a b
hg ci -Am t1
hg debugrename b

hg mv b a
hg ci -Am t2
hg debugrename a

echo % test with --rev
hg debugrename --rev 1 b