Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Merge branch 'develop'
Fix Doxygen link.
Merge branch 'develop'
Merge branch 'develop'
make demo app for POS tagging
issue #38, filesystem::copy_file gives progress for large files
actually increment the progress counter for copy_file
appease g++
remove obsolete file
appease g++ more
clang format knn
don't show copy_file progress if it won't be used
weighted knn
skeleton for nearest_centroid
nearest_centroid classifier
unit test for nearest_centroid
Change default scores in the ranker to the largest negative number.

This is necessary e.g. for the language model rankers, where all scores
will end up negative (sum of log probabilities, which are always negative).