[WP][DOC] (refract): note order of subroutine calls
This is a legacy commit from before 2015-03-01. It may be incomplete as well as inconsistent. See COPYING.legacy and README.history for details. I start to implement an optional reverse order for the filenames in the plot legend. This must be implemented in refract_pgfilenames as well as in refract_pgnamscal This is the first of a series of commits for this feature.