Merge branch '97-make-anaconda-2019-07-finally-stable' into 'master'

Resolve "Make anaconda 2019/07 finally stable"

Closes #97

See merge request Pmodules/buildblocks!132

Programming/anaconda/files/variants

 anaconda/2018.12	unstable	
 anaconda/2019.03	unstable	
-anaconda/2019.07	unstable	
+anaconda/2019.07	stable