Fix Backspace and Delete characters

Backspace key must generate the backspace character (\010) and
Delete key must generate the delete character (\0177). In
some systems the kernel configuration for erasing previous character
is \0177, so some programs (for example cat, ed, mail, ...), can not
understand the correct meaning of backspace. In this cases it is only
needed this command:

	stty erase 

config.def.h

@@ -192,7 +192,6 @@ static Key key[] = {
 	{ XK_KP_Delete,     ControlMask,    "\033[3;5~",    +1,    0,    0},
 	{ XK_KP_Delete,     ShiftMask,      "\033[2K",      -1,    0,    0},
 	{ XK_KP_Delete,     ShiftMask,      "\033[3;2~",    +1,    0,    0},
-	{ XK_KP_Delete,     XK_ANY_MOD,     "\033[P",       -1,    0,    0},
 	{ XK_KP_Delete,     XK_ANY_MOD,     "\033[3~",      +1,    0,    0},
 	{ XK_KP_Multiply,   XK_ANY_MOD,     "\033Oj",       +2,    0,    0},
 	{ XK_KP_Add,        XK_ANY_MOD,     "\033Ok",       +2,    0,    0},
@@ -212,7 +211,6 @@ static Key key[] = {
 	{ XK_KP_7,          XK_ANY_MOD,     "\033Ow",       +2,    0,    0},
 	{ XK_KP_8,          XK_ANY_MOD,     "\033Ox",       +2,    0,    0},
 	{ XK_KP_9,          XK_ANY_MOD,     "\033Oy",       +2,    0,    0},
-	{ XK_BackSpace,     XK_NO_MOD,      "\177",          0,    0,    0},
 	{ XK_Up,            ShiftMask,      "\033[1;2A",     0,    0,    0},
 	{ XK_Up,            ControlMask,    "\033[1;5A",     0,    0,    0},
 	{ XK_Up,            Mod1Mask,       "\033[1;3A",     0,    0,    0},
@@ -248,7 +246,6 @@ static Key key[] = {
 	{ XK_Delete,        ControlMask,    "\033[3;5~",    +1,    0,    0},
 	{ XK_Delete,        ShiftMask,      "\033[2K",      -1,    0,    0},
 	{ XK_Delete,        ShiftMask,      "\033[3;2~",    +1,    0,    0},
-	{ XK_Delete,        XK_ANY_MOD,     "\033[P",       -1,    0,    0},
 	{ XK_Delete,        XK_ANY_MOD,     "\033[3~",      +1,    0,    0},
 	{ XK_Home,          ShiftMask,      "\033[2J",       0,   -1,    0},
 	{ XK_Home,          ShiftMask,      "\033[1;2H",     0,   +1,    0},

st.info

@@ -53,7 +53,7 @@ st| simpleterm,
 	ka3=\E[5~,
 	kc1=\E[4~,
 	kc3=\E[6~,
-	kbs=\177,
+	kbs=\010,
 	kcbt=\E[Z,
 	kb2=\EOu,
 	kcub1=\EOD,