Revision 7181

Fix building by (Build-)Depending on r-cran-mass, which provides r-cran-vr (LP: #755951).

Other changes:
  * debian/control:
    - Corrected VCS URLs.
    - Using Debhelper 8 (debian/compat)
    - Incremented Standards-Version to reflect conformance with Policy 3.9.2
      (no changes needed).
  * Formatted debian/copyright to machine-readable DEP-5 format.
  * Install tests in “/usr/share/doc/r-cran-genetics/tests” (debian/docs),
    document them (debian/README.test), and remove wrong comment that no tests
    are available (debian/README.Debian).