Fixed bug in histtool where the 'select range' code didn't work.     Introduced this bug when fixing the GCA bug this week.
Fixed bug in histtool where the 'select range' code didn't work. 
   Introduced this bug when fixing the GCA bug this week.

bk: 3a286e0diasdC46mrtXx6MxVBQ95RQ
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper