Fix compilation issues post 9.4 merge.

This is the second step towards getting a build that works. Some of the merge
conflicts are rather handled in a trivial fashion and would definitely take
more work to get them working. A case in point example is aggregates. Its amply
clear that aggregate support is broken post merge. PostgreSQL 9.4 changed the
way results of transient functions are stored by aggregates and it nows used
INTERNALOID as a type. Since we need to send these transient results to
coordinators for collection and finalisation, we need to find out a way to do
that. We did some elemenatry changes to let compilation proceed, but its not
going to help ar run-time. There are more such issues post-merger.

Similarly, regression expected outputs are changed without much deliberation. A
complete regression test and analysis is required to fix them.

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