Ve: don't jump to zoom.to after the last item of a group

No more wall hacks!
Ve: document the * and / keys as aliases for +/-
libr/core/vmenus: use r_cons_clear00 where applicable
Fix a typo ("bascked")
Improve "pz?"
Fix pzf, and a little typo
r_asm.h: slightly clarify a comment
Document the difference between "rasm2 -L" and "e asm.arch=?", in source

This difference could also be removed.
Don't say "See r2 -V" in r2 -V

We could also remove this message from r2 -V altogether, but I'd rather keep
it in.
pd: use the TODO esil keyword, instead of ": ".
Ve: show the description of the selected var

This still sucks a little. Long lines should be broken.