[r6rs] on libraries extensions and search paths

[Marco Maggi]

Many R6RS implementations support searching for libraries in
files ending with the ".sls" extension, giving precedence to
an  implementation-specific  extension;  for  example:  when
both

mine.sls
mine.guile.sls

files are  present, Guile should  load "mine.guile.sls" when
looking for "(mine)".  Is there a plan to add this?

  Many R6RS  implementation allow the selection  of a search
path  for libraries  through an  environment  variable; what
about "GUILE_R6RS_LIBPATH"?
-- 
Marco Maggi