1) Internal improvements to handle updatable cursors(1st cut).

src/interfaces/odbc/connection.c

src/interfaces/odbc/connection.h

src/interfaces/odbc/convert.c

src/interfaces/odbc/environ.c

src/interfaces/odbc/execute.c

src/interfaces/odbc/info.c

src/interfaces/odbc/info30.c

src/interfaces/odbc/multibyte.c

src/interfaces/odbc/odbcapi30.c

src/interfaces/odbc/options.c

src/interfaces/odbc/parse.c

src/interfaces/odbc/psqlodbc.h

src/interfaces/odbc/psqlodbc_api30.def

src/interfaces/odbc/psqlodbc_api30w.def

src/interfaces/odbc/qresult.c

src/interfaces/odbc/qresult.h

src/interfaces/odbc/results.c

src/interfaces/odbc/statement.c

src/interfaces/odbc/statement.h

src/interfaces/odbc/tuple.h