Add new KiwiJdbc utilities to convert from an int (used as a boolean) to boolean

[sleberknight]

Add two new static methods to KiwiJdbc:

boolean booleanFromInt(ResultSet rs, String columnName) throws SQLException

boolean booleanFromInt(int value)

These methods are intended for use with database fields that are intended as boolean, for example if you are using MySql which uses tinyint to store "boolean" values as zero or one.

If the database value is NULL, this method will return false (since ResultSet#getLong returns zero when the database value is NULL).

These methods should check that the int value is either zero or one first, and throw an exception (IllegalArgumentException) if not. They should return true for a value of one and false for zero.

Alternatively, these methods could consider zero as false, and anything non-zero as true. In this case, it would never throw an exception. Or, we could have methods that do one or the other, i.e. one "strict" method that only accepts zero or one, and another that accepts zero as false and any non-zero number as true.

[sleberknight]

The booleanFromInt(int value) is generic and not related to JDBC, so it can be moved to KiwiPrimitives.

Created #1054