Merge pull request #436 from linas/master

older libbfds need liberty
Merge pull request #437 from linas/master

more minor bugfixes
Merge pull request #438 from linas/master

Disable viterbi, for now.
Fail gracefully if another AtomSpace publisher module is already using that port
Simplify AtomCollection API
Merge pull request #439 from cosmoharrigan/apiupdate

Simplify AtomCollection in REST API
Provide a new, handy-dandy execution link
Provide a cmake file for the new execution link
compile execution link; also, misc cleanup.
Actually use the executionLink
Provide documentation