Perform a table based lookup
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 Syntax

        H_GRLookup( oGet )

 Arguments:

      oGet - Get Object

 Returns:

      .F.

 Description:

      Performs a lookup on values in a table.  The table must have two
      fields - the first should be a lookup code, and the second should be
      a description field.

      oGet:Cargo should contain an array with the following elements :
          cValue    - Initial value of lookup code
          cDBName   - Alias of table to be looked up
          tRow      - Row of field
          tCol      - Column of field
          bRow      - Bottom row of box
          bCol      - Right column of box
          dRow      - Top row of box (defaults to tRow)
          dCol      - Left column of box (defaults to tCol)
          bReturn   - Code block to return value
          bFunction - Code block to evaluate before exit
          aKeyDesc  - Array of key codes and descriptions
          aGetExitKeys - Keys that will cause an exit from the GET


 Examples:



 Header File: H_LIB52.CH

 Source: GRLOOKUP.PRG

 Author:  Martin Colloby