new extension: fetch -> combine pull and merge/update
pull changes from remote repo.
if changes add new head: merge with new head, commit result.
else: update working dir to new head.
this makes useful command like git 'pull' command.
#!/bin/shmkdir tcd thg initecho a > ahg add ahg commit -m test -d "1000000 0"hg historyhg manifesthg cat ahg verify