Added (incomplete) documentation to files.
- input_node_utils - Added type documentation. May not be the format
  desired so someone should change it.
- plan_node - Unsure about the @doc for one of the functions. Noted
  with "TODO"
Added more documentation, but still incomplete. Please fill in areas
with TODO!
- Removed documentation for records since the #record_name { blah }
  format seems sufficient.
-
Merge branch 'master' of github.com:visemet/yocto-db

Conflicts:
	src/ydb_socket_input.erl