NEW etc.: Use NEW in all obvious places

Entirely automatic conversion, using the following Perl rune:

  perl -i~ -pe 's#^(\s+)(\w+)=safe_malloc\(sizeof\(\*\2\),"[^"]+"\);$#$1NEW($2);#' *.c conffile.fl conffile.y

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>