Improve UI text readability

Indent paragraphs in the UI text to improve readability.
Rename --silent to --quiet

'silent' is a poort name for an option that admits to not being
silent:

  --silent              Only display FATAL errors on stdout

Rename the option to '--quiet' instead and document it in the man
page. It's probably also worth either documenting the fact that
UI text is still printed when --quiet is given in non-batch mode
or changing interactive mode to only print essential prompts when
run with --quiet.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Man page updates
Clean up command line option handling

Clean up variable names and description strings in the command
line parsing ahead of splitting up the SoSReport class into
interface and back-end components.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Merge git://github.com/sosreport/sosreport into patch-1