Make it easier to create a related task

[acetousk]

Do a squash merge

[jonesde]

This looks good aside from the create transition: it is better to use a single service so that validations from service in-parameters are used in the form on the screen; the create WorkEffortAssoc could be added to the existing create#Task service to handle this, or a separate service that does both could be used (adding this to the create#Task service might be easiest/best)