ODBC changes

Hi all,

I've committed the following changes.
Now psqlodbc driver is 7.01.0007.

1) Most driver options are now DSN options.
2) Add a new DSN option *Disallow Premature*.
   (I hope this would fix bugs reported by
   Keith Millard and Michael Rudolph).
3) Improve FE/BE conversation a little(will
   fix a bug reported by Kristis Markis).
4) Handle esacaped date/time parameters.
5) Improve declare/fetch mode a little.
    (select .. for update/select .. into ..)
6) Fix SQLForeignKeys() in multibyte mode.
7) Improve procedure calls.
8) Fix '\\' handling for bytea type.
9) Improve the memory usage in tuple allocation
   a little.
10) Fix a few bugs in parse_statement().

[Internal change]
1) Removed all internal ODBC API function calls.
   (ODBC 3.0 a little for test).
2) Renamed psqlodbc.def to psqlodbc_win32.def so as to
   avoid a conflict with cygwin port.

regards,
Hiroshi Inoue