* Extract neon and neon_test_utils from postgres repo
* Remove neon from vendored postgres repo, and fix build_and_test.yml
* Move EmitWarningsOnPlaceholders to end of _PG_init in neon.c (from libpagestore.c)
* Fix Makefile location comments
* remove Makefile EXTRA_INSTALL flag
* Update Dockerfile.compute-node to build and include the neon extension
* Potential fix to #1626. Fixed typo is Makefile.
* Completed fix to #1626.
Summary:
changed 'error' to 'bail' in start_pageserver and start_safekeeper.
* Add a test case for reading historic page versions
Test read_page_at_lsn returns correct results when compared to page inspect.
Validate possiblity of reading pages from dropped relation.
Ensure funcitons read latest version when null lsn supplied.
Check that functions do not poison buffer cache with stale page versions.
This change brings the following improvements to our build system:
* Now BUILD_TYPE also affects rust apps.
* From now on, cargo will respect `-jN` passed via `make`. However, note
that `rustc` may spawn multiple threads depending on compile flags.
* Cargo is able to cooperate with make to better schedule parallel jobs,
which leads to better build times (-20s in release mode on my machine).
Previously, typos like `BUILD_TYPE=rlease` would silently
lead to building debug binaries. The current approach is also
more future-proof, since we might add `profile`, `valgrind`
as well as other build types.
