Dates correspond (roughly) to SSC Archive releases.

- command -grstyle set nogrid- has been added
- command -grstyle set noextend- has been added
- command -grstyle set plain- now has new options -nogrid- and -noextend-
- -grstyle set margins- now reorders the provided numbers when writing a
  scheme entry (because Stata interprets margins scheme entries as 
  "left right top bottom" instead of the usual "left right bottom top")

- new command grstyle set
- new command grstyle type
- command gstyle refresh discarded; settings are now refreshed automatically

- some minor bug fixes and small improvements

- grstyle released on SSC