branch master updated (9b22c4d -> 504c285)

[Ricardo Wurmus]

rekado pushed a change to branch master
in repository guix.

      from  9b22c4d   gnu: ffmpeg: Update to 3.3.1.
       new  6365733   doc: Document certificate environment variable needed for 
R.
       new  9fdda0b   gnu: librecad: Use modular Qt.
       new  504c285   gnu: Add dcmtk.

The 3 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 doc/guix.texi                     | 13 ++++++++
 gnu/local.mk                      |  1 +
 gnu/packages/engineering.scm      |  3 +-
 gnu/packages/image-processing.scm | 65 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 81 insertions(+), 1 deletion(-)
 create mode 100644 gnu/packages/image-processing.scm