Consolidated conditional

Instead of separate checks for the presence of cc_author_postauthor,
and then a change in the value, this is all now conducted in a single
If statement.
strip_tags only for 'display_name'

Apply strip_tags only to ‘display_name’ and leave ‘description’ as is.
Created functions for filtering WordPress author info

Created the functions that do the actual displaying of per-post author
data on the front end.