FilterTweets: Fix bugs
FilterTweets: Rewrite to work with user/timestamp not tweet ID
FilterTweets: handle parse errors better
CoTraining: Add FieldSpring jar
CoTraining: New file (compiles but not tested or finished)
CoTraining: More code (compiles but still not tested or finished)
CoTraining: More code (compiles but still not tested or finished)
CoTraining: More code (compiles but still not tested or finished)
CoTraining: More code (compiles, partly tested but not finished)
GridLocate: Allow spec of which hierarchical levels to save and which to load