Applied jdbc patch from Kim Ho at RedHat to improve boolean support, as well

as some additional regression tests for this an other recent changes.

 Modified Files:
 	jdbc/org/postgresql/jdbc1/AbstractJdbc1ResultSet.java
 	jdbc/org/postgresql/test/jdbc2/DateTest.java
 	jdbc/org/postgresql/test/jdbc2/ResultSetTest.java
 	jdbc/org/postgresql/test/jdbc2/TimeTest.java
 	jdbc/org/postgresql/test/jdbc2/TimestampTest.java