Remove xterm+256color again but check /lib/terminfo

The terminal defintions with a + are just building blocks, not full
definitions. We can't use them.

OTOH, the definitions in /lib/terminfo seem to work fine in current
Debian and Ubuntu versions (which is what I care about these days), so
we accept them.

.znewterm

@@ -23,20 +23,23 @@ then
 	stty erase 
 fi
 
-if [[ $TERM == xterm-256color && ! -f /usr/share/terminfo/x/xterm-256color ]]
+if [[ $TERM == xterm-256color && ! -f /usr/share/terminfo/x/xterm-256color && ! -f /lib/terminfo/x/xterm-256color ]]
 then
 	TERM=xterm
 fi
 
 if [[ $TERM == xterm ]]
 then
-        for t in xterm-256color xterm+256color
+        for t in xterm-256color
         do
-                if [[ -f /usr/share/terminfo/x/$t ]]
+                for dir in /usr/share/terminfo/x /lib/terminfo/x/
-                then
+                do
-                        TERM=$t
+                    if [[ -f $dir/$t ]]
-                        break
+                    then
-                fi
+                            TERM=$t
+                            break 2
+                    fi
+                done
         done
 fi
 
@@ -57,7 +60,7 @@ case "$TERM" in
         ;;
 esac
 
-if [[ $TERM = xterm || $TERM = xterm-256color || $TERM = xterm+256color ]]
+if [[ $TERM = xterm || $TERM = xterm-256color ]]
 then
 	if [ -f ~/.zxtermcolors ]
 	then