maps: add a load method to base map Since all three map classes (authors, tags, branches) have the exact same logic for their load method, we add a generic one to base map so that each one can use it.

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

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