#2 some important bugs

[Cai Qian]

1. man and info commands behave badly throught UTF-8
filter in console.

2. man and info commands behave badly in X11 through
libggi and libsdl, also can't handle PAGEUP and
PAGEDOWN correctly.

3. first in cce, then `top`, press "q", followed by
several "Enter", there has "Segmentation Fault"
happened. This is a bug in both modes.