[NTG-context] Typo in buff-ini.lua

Hi Hans, In buff-ini.lua, line 73 should be return concat(t,separator or "\n") -- AM: was \r Otherwise, the following gives a wrong output: \startbuffer[one] This is one \stopbuffer \startbuffer[two] This is two \stopbuffer \ctxcommand{savebuffer({"one", "two"}, "test.tmp")} \end Aditya