pgsql: Variable renaming in preparation for refactoring

Variable renaming in preparation for refactoring

Rename page -> block and dp -> page where appropriate.  The old naming
mixed up block and page in confusing ways.

Author: Melanie Plageman <melanieplageman@gmail.com>
Discussion:
https://www.postgresql.org/message-id/flat/CAAKRu_YSOnhKsDyFcqJsKtBSrd32DP-jjXmv7hL0BPD-z0TGXQ@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8e1db29cdbbd218ab6ba53eea56624553c3bef8c

Modified Files
--------------
src/backend/access/heap/heapam.c         | 216 +++++++++++++++----------------
src/backend/access/heap/heapam_handler.c |  28 ++--
src/include/access/heapam.h              |   2 +-
3 files changed, 123 insertions(+), 123 deletions(-)