[MITgcm-support] MNC usage comment & more powerful version of gluemnc

[Mark Hadfield]

Thanks for those tips, Martin. That's exactly the sort of "usage lore" I 
was after.

-- 
Mark Hadfield          "Ka puwaha te tai nei, Hoea tahi tatou"
m.hadfield at niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)