sq stream types
add no-unknown-changelist option
add ignore-rcs option to compare
add progress logging to compare
wait until after import succeeds to save the cache
always update the commit marker (this is required now we're using from for merges. otherwise merges don't reference their 1st parent)
use popen.communicate rather than popoen.stdout (which is deprecated)
upgrade to argparse so that you can pass options to p4 in the debug command
factor compare into tighter functions
implement changelist number on command line for compare