startable.writers property provides additional
output handlers which
can use for writing tables.
Its value is a colon-separated list of class names, where each
element of the list must be the name of a class on the classpath
which implements the
StarTableWriter interface and
has a no-arg constructor.
When a new
is constructed, an instance of each such named class is created
and added to its handler list. Users of the library can therefore
write tables in the format that the new handler knows how to
write to by giving its format name when performing the write.