pspp: 0.8.3: fix GUI issues

Closes #1001.
mafft 7.157 + new test

Closes #1005.
R: add test.

Closes #1007.
Tisean: Add caveats.

Closes #993.
gdcm: 2.4.2

Closes #1002.
snpeff: fix bug in wrapper script

Fixes issue with `-cancer` and `-canon` arguments passing through snpEff wrapper (chapmanb/bcbio-nextgen#441). Sent upstream so can remove on next release (pcingola/SnpEff#35).

Closes #1006.
Maxima 5.33.0

Closes #1011.