add 'moveamount' to cwmrc; it sets keyboard movement amount, making

it more useful on large screens
manpage tweak & ok jmc@
ok okan@, oga@

conf.c

@@ -77,6 +77,7 @@ conf_init(struct conf *c)
 {
 	c->flags = 0;
 	c->bwidth = CONF_BWIDTH;
+	c->mamount = CONF_MAMOUNT;
 
 	TAILQ_INIT(&c->ignoreq);
 	TAILQ_INIT(&c->cmdq);