Wed Oct 30 08:51:43 EST 2002
amplodbc.c, ampltabl.dll, TABLES.RME:  extend the "standard" ODBC
table handler to recognize new optional string maxlen=nnn (just before
the optional 'verbose') among the Strings to specify the maximum
length of strings (symbolic parameters) read from the table.  The
default is 480, which will probably suffice for most purposes.
Strings longer than maxlen will be truncated to maxlen characters when
the table is read.

Tue Aug  5 22:51:54 EDT 2003
amplodbc.c, ampltabl.dll:  have "write table" preserve old columns
of an INOUT table even when the table is initially empty, and for
columns of type text, retain the text type even when the column
ends up having exlusively numeric values.

Tue Dec  6 09:59:00 EST 2005
amplodbc.c: minor tweaks for portability to 64-bit MS Windows.

Tue Jan  1 17:57:59 MST 2008
amplodbc.c:  tweak for MS SQL Server 2005:  for numeric values,
successively try SQL_DOUBLE, SQL_FLOAT, SQL_REAL, and SQL_NUMERIC
rather than SQL_DOUBLE, SQL_NUMERIC, and SQL_REAL.

Wed Jan  2 23:25:35 MST 2008
amplodbc.c:  adjust the date shown when "version" is specified.
(Missed updating this lately when making changes.)

Thu Sep 23 13:31:28 MDT 2010
amplodbc.c:  attempt to pass a plausible window handle to
SQLDriverConnect().  If need be, a handle can be specified by setting
$sw_HWND to a hexadecimal value (without a leading 0x) in the
environment passed to AMPL.  With some incomplete or incorrect
DRIVER=...  settings, this will cause a dialogue box to appear
in which corrections can be attempted.  Setting $sw_HWND to 0
disables this new behavior.
  Ignore case for "DRIVER=", "SQL=", and "DSN=" (e.g., treat "Driver="
and "driver=" the same as "DRIVER=").

Tue Nov  2 17:26:08 MDT 2010
amplodbc.c:  fix a bug that led to a seldom-seen error message of
the form "ColAlloc: cols[5].sinv already allocated."

20111024
  Add optional strings 'nsmix=...' and 'write=append' or
'write=drop' to the possibilities for strings in table declarations
for tables handled by the ODBC table handler (usually called
ampltabl.dll), and allow 'verbose=n', with 0 <= n <= 3, as
alternatives to 'verbose'.  For details, in an AMPL session with
the updated ampltabl.dll loaded, issue the command
	print _handler_desc['odbc'];