[PATCH] fix scope and url menu when using termcap

Scope and URL Menu both looking strange when bilding with
'--with-screen=termcap'. Attached patch fixes that.

Furthermore, I have changed the way URLs are handled inside page.c
(fixed length -> dynamic buffer). This is a first step to deal with very
long URLs (escape_shell_meta() and tin_getline() also using fixed size
buffers, so very long URLs are still cut off).

Dennis