ADD: Add a shell step that allow to execute external commands using the system shell.
UPDATE: Move CopyInputDataStep and CopyOutputDataStep to root steps package.
ADD: Add a new step: DiffanaResultsAnnotationStep that generate annotated diffana files in tsv, ods and xlsx formats.
TYPO: Fix description of the step in ExpressionResultsAnnotationStep; rename some local variables.
FIX: Now do not add to the workflow the last steps of the workflow that are skipped.