maps: add the "clear" method to RevMap This is a part of the bigger plan to get rid of reading or writing rev_map directly without going through the RevMap class. The "clear" method is used in rebuildmeta.

#!/bin/sh
. $(dirname $0)/common.sh

for b in `hg branches -aq` ; do
    hg co $b || break
    echo verifying $b
    hg svn verify
done