HPCC-8541 - Add examples illustrating calling Python and Java from ECL

Add a second Python example, and fix some code in the first example that was
not freeing Python objects (changed the code when debugging and forgot to
change back).

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
HPCC-8541 - Add examples illustrating calling JavaScript from ECL

Add an example using the V8 Javascript engine from ECL

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>