REANA-UI 0.9.1

• Adds support for previewing PDF files present in a workflow's workspace.
• Adds support for previewing ROOT files present in a workflow's workspace.
• Adds support for signing-in with a custom third-party Keycloak instance.
• Adds a new menu item to the workflow actions popup to allow stopping running workflows.
• Changes the workflow deletion message to clarify that attached interactive sessions are also closed when a workflow is deleted.
• Changes the workflow progress bar to always display it as completed for finished workflows.
• Changes the interactive session notification to also report that the session will be closed after a specified number of days of inactivity.
• Changes the workflow-details page to make it possible to scroll through the list of workflow steps in the job logs section.
• Changes the workflow-details page to not automatically refresh the selected job when viewing the related logs, but keeping the user-selected one active.
• Changes the page titles to conform to the same sentence case style.
• Changes workspace file preview to support customisable maximum file size limit allowed for previewing.
• Changes nginx configuration to save bandwidth by serving gzip-compressed static files.
• Changes the launcher page to show warnings when validating the REANA specification file of the workflow to be launched.
• Changes the launcher page to allow showing custom demo examples.
• Fixes calculation of workflow runtime durations for stopped workflows.