DataTracker throws PSQLException at CopyManager.copyIn if sourcename contains non-ASCII character

[sammyjava]

So this is an i8n bug. I have a source named "vigun.iSelect-consensus-2016.gen.Muñoz-Amatriaín_Mirebrahim_2017". The data tables load fine, but the integration fails, throwing the following exception:

Caused by: org.postgresql.util.PSQLException: ERROR: invalid byte sequence for encoding "UTF8": 0xf1 0x6f 0x7a 0x2d
  Where: COPY tracker, line 1, column sourcename
        at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2433)
        at org.postgresql.core.v3.QueryExecutorImpl.processCopyResults(QueryExecutorImpl.java:1114)
        at org.postgresql.core.v3.QueryExecutorImpl.writeToCopy(QueryExecutorImpl.java:996)
        at org.postgresql.core.v3.CopyInImpl.writeToCopy(CopyInImpl.java:35)
        at org.postgresql.copy.CopyManager.copyIn(CopyManager.java:224)
        at org.postgresql.copy.CopyManager.copyIn(CopyManager.java:203)
        at org.intermine.dataloader.DataTracker.writeMap(DataTracker.java:551)
        at org.intermine.dataloader.DataTracker.flush(DataTracker.java:404)
        ... 139 more

This isn't an InterMine bug per se, but it means that if we use org.postgresql.copy.CopyManager.copyIn(String, InputString) to populate the tracker table, we're not supporting international source names. (That's arguably a bug in copyIn, since 0xf1=ñ is most definitely a UTF-8 character, and that's under the JDBC package.)