Improving function to get OTT IDs in jython and fixing a bug on casting ...

...data before calling the induced tree service.

I placed the tnrs script under the opentree folder to make it simpler to install this module (but I did not delete the existing folder opentreeutils). The new functionality is to parse the JSON from OpenTree to extract the OTT ID into a new column. Then, the code needed to create a column with OTT IDs becomes:
import tnrs
return tnrs.getOttId(value)

The servlet jar under MOD-INF also prevents OpenRefine from starting, but I did not move the jar back to the original lib folder.