Signed-off-by: NEkta Khanna <ekhanna@pivotal.io>
Signed-off-by: NXin Zhang <xzhang@pivotal.io>

Before this patch, consumers of ORCA had to know out-of-band which
flags were used to compile ORCA, because e.g. ORCA compiled with
GPOS_DEBUG would only work if the application using ORCA was also
compiled with GPOS_DEBUG. This is because many of the structs differ
depending on GPOS_DEBUG. Same for the architecture flags, like GPOS_i386.

The new config.h file is #included from a few central other header files,
to make sure it gets included in any application that uses other gpos
headers. We probably should include config.h from all other gpos header
files, to be sure, but this seems to be enough for ORCA itself and GPDB at
least.

Bump version number to 2.2.

None of this was used. The reason to purge it now is that I want to remove
the CSocket code from gpos, and this was the only thing that depended on
that.

Bump ORCA version number to 1.654

We still default to shared libraries, but you can use the
"cmake -DBUILD_SHARED_LIBS=off" option to build static libraries instead.

One simple trick to make your IDE 10x faster.

This is mostly copy-pasted from CoerceToDomain. AFAICS, CoerceViaIO nodes
don't need any special treatment in ORCA, we just need to accept them from
GPDB and be able to regurgitate them back.

This reverts commit d81c86fa.