Modifications to Depend only on pivotals, debias, and abremPivotals
Streamlined the Description of package (scope of technical coverage is deferred to Dependant packages)  Removed empty inst folder and non-standard gpl-3.0.txt document, which produced Notes on check.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/abernethy@96 edb9625f-4e0d-4859-8d74-9fd3b1da38cb