2001/12/02 In dappp.c, report unused variables.
           Make writing to dataset "dap_null" not write.
2001/11/19 In ps.c, in function "show", allow multiline text.
2001/11/15 In "plotlinreg", "plotlogreg", and perhaps other
           functions, code depends on orginal observations
           having _type_ "OBS".
2001/11/14 For Version 1.5: if a variable list
           for a function starts with a '!', use
           all the variables except those listed.

Dap is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

