Removing cmake files that were used only by DataSeries and
ElasticSearch.
Fixes for linking external dynamic libraries to dynamic plugins.
Merge remote-tracking branch 'origin/topic/robin/reader-writer-plugins'

* origin/topic/robin/reader-writer-plugins:
  Fixes for linking external dynamic libraries to dynamic plugins.
  Removing cmake files that were used only by DataSeries and ElasticSearch.