Removed the special 'sequential' task type.
Reimplemented sequential tasks with inter-cycle triggers.
(Re)Documented sequential tasks.
Fixed some test suites.
Fixed a typo.
Minor coding efficiency improvements (credit M.Shin).
cylc/cylc#49: titles/descriptions in gui tooltip

This change adds titles and descriptions for tasks and
families (if available) to the hover-over information in
cylc gui. There is now hover-over functionality in the text
or tree view.
Fixed some CUG typos.
Made unregister remove passphrase and suite.rc.processed.
Merge pull request #847 from hjoliver/fixed-some-cug-typos

Fixed some CUG typos.
cylc/cylc#49: blank default suite/task titles

This makes the default title and description fields
blank for the suite, tasks, and families.
Space after list-comma.
Extend registration test.
Corrected new obsoletion version numbers.
Merge pull request #849 from hjoliver/unreg-remove-passphrase

Made unregister remove passphrase and suite.rc.processed.
Corrected ready-to-spawn state list.
Sensible validation error for sequential async tasks.
Merge pull request #826 from hjoliver/810-remove-sequential-tasks

Removed the special 'sequential' task type.
cylc test-battery: fix get-global-config for site.rc hosts.

This fixes the get-global-config test when more than one
site.rc host is specified. This is due to the use login
shell line appearing once per host, not just once.

The sed change takes the first occurrence of use login
shell following a line that looks like [[localhost]].
Removed two accidentally-committed suite passphrases.