References + Addition of Company Class

Added ref: Logic to Presentation, Data to Logic.

Added Company.vb to Logic Tier.
Corrected IInvoice to Invoice.
Tier Communication

Tiers are communicating, I am now looking into getting the required data
from the database. (Committing as i go).
Fixed namespace problem by taking added namespace from DataTier. Need to do the same to Threetier. Also changed code to use OleDbAdapters instead of SQLAdapters.
Figuring out com.

Edited out much of B's code, trying to get company loading from DB - I
must be doing something wrong

Figured i'd commit and let you take a look