Some tweaks and fixes for integer cycling.
cylc gui: remove extra HSeparator
Merge pull request #1122 from benfitzpatrick/cylc-gui.remove-tree-view-extra-sep

cylc gui: remove extra HSeparator
Show marked-up estimated or true finish time in text view.
add cylc migration info
Returned some date-time calculations to the daemon.
Added an icon for unknown state.
Back compat for gcylc graph view.
Fix for gcylc dot-size.
Tidy previous commits.
Proper section anchors, but not TOC
add advanced R1 information
Merge pull request #1123 from hjoliver/1121-gcylc-tfinish

Show marked-up estimated or true finish time in text view.
Merge pull request #1125 from benfitzpatrick/doc.improve-html-anchors

documentation: improve html anchors
Merge pull request #1126 from benfitzpatrick/doc.migration-reference

documentation: migration reference
Fixed cug PDF right margin overruns.
Document that implicit cycling is dead.
Removed obsolete documentation.
Updated previous.
Merge pull request #1128 from hjoliver/doc.follow-migration-ref

Document that implicit cycling is dead.