Added _all_funcs() for more flexibility with outputting function list
Added _all_funcs() for more flexibility with outputting function list

It's useful to be able to pretty-print the available functions for the
builtin help text. It's also useful to be able to list the available
functions in a format more suitable for scripting. This will be used to
help generate the README.

whiteinge/ok.sh,chefsunny/ok.sh