improve multiple results support

The specification talks exactly about -1:
> Returns: the current result as an update count;
> -1 if the current result is a ResultSet object or there are no more results

Other negative numbers can theoretically mean something different than „no more results“
e.g. unknown number of updates (?).

 #!/bin/bash

 cat \

 	src/main/java/info/globalcode/sql/dk/CLIParser.java \

 	src/main/java/info/globalcode/sql/dk/CLIStarter.java \

 	| ../../scripts/help_generator.pl