Alter feature scenarios to label sorted output

This breaks two features:
* Record Manager views records sorted by gender and last name.
* Record Manager views records sorted by last name descending.
Implement features under new scenarios

Added the heading for each sorted set.
Amend step description to fit current behavior

At present, the behavior implemented does not include the notion
of Record Managers choosing which sorting to view. Since this is
an involved enhancement, the step is hereby amended to more accurately
describe the implemented feature, with choosing to be implemented
later.
Alter scenarios to ensure ordered output

The new syntax for these scenarios requires that the heading is
printed before the records; the last one did not.
Add blank lines to feature scenario expected output

The blank lines will delimit the sorted record sets and make output
easier to read.

* This change breaks two implemented features.
Implement blank line before heading.

All features passing.