caf: mv #_local -> #_push; fix #rsync bug. new optin --no-local

* Rename the Bash method (_local -> _push)
* Fix #rsync bug: using -ra option will transfer local perms. to remote
* New --no-local option to tell #caf not to execute #_local method
Remove empty #caf directory in #root
README: long update (with errors, of course)