[BioC] Update to flowMerge

[Greg Finak]

Attention, flowMerge users
We have fixed a bug that crept into the 2.0.0 release of flowMerge
which caused outliers in merged clusters to be called incorrectly as
well as negatively impacting the plotting of merged clusters.

This has been resolved in release version 2.0.2 and development version 2.1.2
If you are using flowMerge, please update your package version.

Sincerely,

Greg Finak
Post-Doctoral Fellow
PS Statistics, Vaccine and Infectious Disease Division
Fred Hutchinson Cancer Research Center
Seattle, WA