Backed out part of the change from 1.6. The attempt to support int8 binds

Backed out part of the change from 1.6.  The attempt to support int8 binds
in such a way that indexes on int8 columns would be used (by quoting the value)
caused other problems.  Will need to wait for the backend to properly fix
the root problem.

 Modified Files:
 	jdbc/org/postgresql/jdbc1/AbstractJdbc1Statement.java