Backport the ODBC Loader to work against the Vertica 6.0 SDK (with an extra option to 'make').  6.0 users lose some rarely-used 6.1-specific features.

Update the README accordingly.  Also, take this opportunity to update the README generally.
Merge pull request #32 from aseering/odbc_loader_v60_fix

Backport the ODBC Loader to work against the Vertica 6.0 SDK (with an ex...