Office hours -> lab hours.

HH 310 (what used to be the wireless lab) has been scheduled for 438-505 from
6:15 to 7:15 on Mondays and Wednesdays for the rest of the semester.  I'll be
holding office hours in 310.  Office hours are essentially turning into a lab
section, although it can still be treated as office hours if needed (prior
arrangements recommended for office hours).  Attendance expectations are the
same as they were for office hours (that is, it's up to you).

This change takes effect today (Wednesday, 11 February).  Starting next week
I'll be doing code reviews for assignment 1, and maybe even live code the first
assignment.