Modify visit part

1. Remove blood press inputs.  Set values for bps and bpd to 0.
2. Under Drug Allergies and Contraindications: rename “No” button to
“NKDA”.
3. For target weight calculation: If weight goal < calculated target
weight, then set target weight = weight goal.
4. Add a selection for pregnancy status (yes/no) under Medical History
and Complaints.  When the user presses Run Algorithm button, then
display a message “this algorithm does not apply to diabetes patients
during pregnancy”.