Log message:
Add SHA512 digests for distfiles for devel category

Issues found with existing distfiles:
	distfiles/eclipse-sourceBuild-srcIncluded-3.0.1.zip
	distfiles/fortran-utils-1.1.tar.gz
	distfiles/ivykis-0.39.tar.gz
	distfiles/enum-1.11.tar.gz
	distfiles/pvs-3.2-libraries.tgz
	distfiles/pvs-3.2-linux.tgz
	distfiles/pvs-3.2-solaris.tgz
	distfiles/pvs-3.2-system.tgz
No changes made to these distinfo files.

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Update to 1.6.0:

v1.6.0
======

* bail out early if the scm is missing

  this brings issues with git tarballs and
  older devpi-client releases to light,
  before we would let the setup stay at version 0.0,
  now there is a ValueError

* propperly raise errors on write_to missuse (thanks Te-jé Rodgers)

Log message:
Import py34-setuptools_scm-1.5.5 as devel/py-setuptools_scm.

setuptools_scm handles managing your python package versions in
scm metadata. It also handles file finders for the supperted scms.