Add option to change default or suppress 'Show More Details' button

Add option to change default or suppress 'Show More Details' button

Conifer makes heavy use of Dan Scott's ResolverResolver service for
e-content and typically wants to bring most details about entries on a results
screen to the front. This adds a 'show_more_details.default' option
in 'config.tt2' that can have the values 'true', 'false' and 'hide'. The
'true' and 'false' values set the default for the button to more and
less respectively, and 'hide' suppresses the button from showing at all.

Signed-off-by: Art Rhyno <art632000@yahoo.ca>