Tiny update to make TimeSlicer honour the default behaviour suggested for summary command line option.
Tiny update to make TimeSlicer honour the default behaviour suggested for summary command line option.

git-svn-id: 67bc77c75b8364e4e9cdff0eb6560f5818674cd8@3753 ca793f91-a31e-0410-b540-2769d408b6a1

armanbilge/BEAST_sandbox,svn2github/beast-mcmc,svn2github/beast-mcmc,armanbilge/BEAST_sandbox,svn2github/beast-mcmc,armanbilge/BEAST_sandbox,svn2github/beast-mcmc,armanbilge/BEAST_sandbox,svn2github/beast-mcmc,armanbilge/BEAST_sandbox