data: add ProjectsDag type
cmt: add ProjectsDag
utils: add project_release. consolidate
cmt: add Package function
all: gofmt
examples: reorg
examples: reorg
examples: find-pkg
all: first fixups to DAG
example: simplify
all: gofmt
tagdiff: first stab
tagdiff: diff->tagdiff
tagdiff: use tags
doc: add some godoc doc.
tagdiff: add godoc
tagdiff: chan cleanup
cmt: special case for cmt.New(nil) => take env from os.Environ
tagdiff: dont leak cmt.Setup