Remove ODBC todo, add to main TODO.

src/interfaces/odbc/TODO.txt

-
-ODBC Driver TO-DO List                    
-Last Updated:  9/16/98
-
-
-Task                                                Added      Priority  %Complete?
------------------------------------------------------------------------------------
-Implement 6.4 protocol changes                      09/16/98   high
-Handle multi-row rowsets (SQLBindCol)               09/16/98   med
-Port to 16 bit?                                     04/20/98   med
-Handle Literal precision in parsing                 07/01/98   med
-Cache SQLColumns at a higher level (henv or dll)    07/02/98   med
-Add lo_text type to map to LONGVARCHAR              07/09/98   low
-Add encrypted password capability                   06/11/98   low
-Remove tuplelist structure                          06/25/98   low
-Support SQLTables "%" semantics                     07/01/98   low