Implemented JDBC3ResultSet.isSigned(int).
Implemented JDBC3ResultSet.isSigned(int).

JDBC3ResultSet.isSigned(int) does now return true if the type of the
column is either "NUMERIC", "INTEGER" or "REAL". In all other cases it
returns false.

xerial/sqlite-jdbc,xerial/sqlite-jdbc,paramvir-b/sqlite-jdbc,xerial/sqlite-jdbc,paramvir-b/sqlite-jdbc,paramvir-b/sqlite-jdbc,paramvir-b/sqlite-jdbc,xerial/sqlite-jdbc