[NTG-context] \savebuffer

Hi Hans, can you add a \savebuffer variant which works like the first version of the command where \savebuffer[<buffername>][<filename>] saved the buffer as <filename> and not as \jobname-<filename>.tmp like it currently does. Instead of a new command a key-val-version of \savebuffer would do the job as well, e.g. \savebuffer[list=<buffername>,file=<filename>,prefix=no] or something similar. Wolfgang