Added: show_help(), show_usage().

  Both use show_usage_or_help() internally.

--HG--
extra : source : 3d6fc1ad903969cc18646e172ea0c0673ad7faf6
  use the common-code for usage-info

--HG--
extra : source : d26bf2b2537e74c6b74a9d2752a2fd67c9ff04c7
  Updated to use our common code.

--HG--
extra : source : ecacba53a1fe686f1367fe633bdd21cb0473e9e0
  Updated to use common code for --help/--manual

--HG--
extra : source : e6bf73eb1da17e8575a3e3e1a9199710af66b426
  removed debugging print-statement

--HG--
extra : source : 5b2678278bff7a57b51dd22dc6c8728335fa8069
  Use common-code for --help/--manual

--HG--
extra : source : 327661b730f309ba089767a1283fca52ec26f524
  Removed trailing whitespace

--HG--
extra : source : 7915c1def0df1b61fdcfdaebe1d4bde8b07055a9
  Use common-code for --help/--manual

--HG--
extra : source : 7396be4e538ececf7012ab74a5738b389fdad912
  Updated to use common-code for --help/--manual

--HG--
extra : source : 3dc54e35b59fe12b8cb361f80436718bf1aa20ff
  renamed functions.

--HG--
extra : source : 453de7d3261f47df5bc796f116c0ac0089761067