Added options for controlling indentation in lists and in *blurb

Added options for controlling indentation in lists and in *blurb
output in the AUTHORS section. Controlled through the
man.indentation.lists.adjust, man.indentation.lists.value,
man.indentation.authors.adjust, and man.indentation.authors.value
parameters. Default is 3 characters (instead of the roff default
of 8 characters). Closes #1449369.

Also, removed the indent that was being set on informalexample
outuput. I will instead add an option for indenting verbatims,
which I think is what the informalexample indent was intended for
originally.