Gittrac #4115: Updated the main DAGMan chapter of the manual for the
node status file changes; added a link from the version history item
to the appropriate manual section.
Merge branch 'V8_1-gittrac_4115-branch' into V8_1_6-branch

Conflicts:
	doc/version-history/8-1.history.tex
Gittrac #4115: Fixed a minor typo in the new node file documentation.