add DB's (slightly tweaked) changes to make resizing more flexible, and
David Lawrence Ramsey authored
also add his replacement of RETSIGTYPE with void, which avoids some
potential problems


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2289 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
5040666f