Adjustments to changes in the AnnotationSheet class.
All functions now use the global variable in file scope directly, rather than shadow it with a function parameter.
Added support for automatic, temporary merging with accessory cohorts before variant quality score recalibration (VQSR) and automatic de-merging thereafter.
Introduced a module variable to configure the output directory.
Changed paths for STDOUT and STDERR to be relative to the DRMS working directory.
In Analysis.create_public_project_link create relative symbolic links.
Create symbolic links directly in place, rather than running chdir twice.