couple of id in externalized code
updated for rmr 3.0
export new ops

Merge branch 'master' into dev

Conflicts:
	docs/tutorial.html
	docs/tutorial.md
	pkg/tests/tutorial.R
merge from master
organize, remove some obsolete rmr2 artifacts, add merge ones
repair the group-sumarize and lm examples
fix up the presentation
can't deduce columns if names are made unique
refreshed presentation