Squashed 'www/mmirf/' changes from 51155a1..3b48c08

3b48c08 added (rather primitive) mechanism that allows discriminating between android and ios env-setting; TODO: implement more elaborate mechanism
6b2d9ea BUGFIX by @mkunz: apply stopword removal using word-boundaries (i.e. do not "cut out" matches that occur within a String: e.g. for stopword "in" -> match " in. " but not within "going")

git-subtree-dir: www/mmirf
git-subtree-split: 3b48c08eb4791d0e2488390e2f895fd3e0748c43
Merge commit '67b6c74ea615e2bf232c0b3dce9156921f9c32ce'