gnu: Add OpenMW.

* gnu/packages/game-development.scm (openmw): New variable.

gnu: Add mygui.

* gnu/packages/game-development.scm (mygui): New variable.

gnu: Add ogre.

* gnu/packages/graphics.scm (ogre): New variable.

gnu: Add r-methylkit.

* gnu/packages/bioinformatics.scm (r-methylkit): New variable.

gnu: sassc: Update to 3.4.5.

* gnu/packages/web.scm (sassc): Update to 3.4.5.
[arguments]: Add PREFIX to make-flags, disable tests, remove custom install
phase.

gnu: mariadb: Update to 10.1.26 [fixes CVE-2017-{3636,3641,3653}].

* gnu/packages/databases.scm (mariadb): Update to 10.1.26.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: Add r-ksamples.

* gnu/packages/cran.scm (r-ksamples): New variable.

gnu: Add r-suppdists.

* gnu/packages/cran.scm (r-suppdists): New variable.

gnu: Add r-energy.

* gnu/packages/cran.scm (r-energy): New variable.

gnu: Add r-fitdistrplus.

* gnu/packages/cran.scm (r-fitdistrplus): New variable.

gnu: Add r-limsolve.

* gnu/packages/cran.scm (r-limsolve): New variable.

gnu: Add r-lpsolve.

* gnu/packages/cran.scm (r-lpsolve): New variable.

gnu: Add r-qvalue.

* gnu/packages/bioinformatics.scm (r-qvalue): New variable.

gnu: Add r-fastseg.

* gnu/packages/bioinformatics.scm (r-fastseg): New variable.

gnu: Add r-emdbook.

* gnu/packages/cran.scm (r-emdbook): New variable.

gnu: r-trimcluster: Update license.

* gnu/packages/statistics.scm (r-trimcluster)[license]: Also specify GPLv3+.

gnu: Add r-bbmle.

* gnu/packages/cran.scm (r-bbmle): New variable.

gnu: Add r-inline.

* gnu/packages/cran.scm (r-inline): New variable.

gnu: Add r-lmtest.

* gnu/packages/cran.scm (r-lmtest): New variable.

gnu: Add r-extremes.

* gnu/packages/cran.scm (r-extremes): New variable.