foldl1 implementation
Update optparse-applicative bound to match used features

Having an earlier version than 0.8 was met with failure to compile
Merge pull request #1285 from Heather/master

foldl1 implementation
Merge pull request #1290 from Melvar/fix-optparse-bound

Update optparse-applicative bound to match used features
Merge branch 'master' into JavaBackendFixes