New API function on FdoIConnection

[Robert Fortin]

If you are developing a provider for 3.2.X branch, please be advised
that there was a change in the FDO API for FdoIConnection and
FdoIConnectionCapabilities.
 
A new flush function is added to the FdoIConnection class and a new
capability(SupportsFlush) is added to the FdoIConnectionCapabilities.
Only the SDF and SHP provider implements the new Flush function. The
remaining provider will report that Flush is not supported.
Some file based providers maintain a cache of the inserted or updated
features. The new function can be used to force those provider to write
any cached data.

Thanks!

RF