4.6.3beta incomplete state

Contains an important bug fix to the Manning coefficient described at
  http://depts.washington.edu/clawpack/users-4.6.3/manning.html

Added new documentation on GeoClaw and new example apps/tsunami/chile2010b.

Making available for PASI workshop on Tsunami modeling taking place in Chile in Jan, 2013,
  http://www.bu.edu/pasi-tsunami/