cylc-7.8.2 release

[Hilary Oliver]

Maintenance release with bug fixes minor enhancements.

Changes include: a new "aborted" suite event to alert on unexpected shut down; restored single-page User Guide; cylc graph: automatic and default styling fixes and improvements; make suite context available to custom Jinja2 filters; and more.

See CHANGES.md for details.

Releases can be downloaded from the front page of the Cylc web site: https://cylc.github.io/

Regards,

Hilary