Changes in version 2.0.1:

    o   New vignette

    o   Feature: construct SigCheckObject from existing SigCheckObject

    o   Feature: 3-group KM

    o   Feature: impute missing feature values

    o   Feature: user-defined scoring function

    o   minor bugs and man pages fixes

Changes in version 2.0.0:

    o   Major revamp. Survival analysis, S4 object, etc.

Changes in version 1.0.0:

    o   Initial release.