Add branchtags function with cache
- cache stores tipmost node and rev and node,label pairs
- if cache is out of date, scan new changesets
- write new cache out after scan
#!/bin/shunset HGUSEREMAIL="My Name <myname@example.com>"export EMAILhg init testcd testtouch asdfhg add asdfhg commit -d '1000000 0' -m commit-1hg tip