[gpm] alps tapping finally works

[Andrea Dieni]

Hi Peter,
the tapping works. Well it didn't on the first try but later I remebered
to disable wmode and now tapping is ok. It works even with the previous
version of alps.c.
There's still something strang with corner tapping and I'm trying to mana=
ge
it. I'll send you an accurate (I'll do my best with my poor English) desc=
ription
of the corner tapping behavior and hope some useful debug output.

Andrea