Revert "Revert "Merge branch 'next' into sam_multiple_index_writes""

This reverts commit cda0e411e51c564513bd070fabaafa57f8bf109f.
Revert "Revert "Merge branch 'sam_multiple_index_writes' into sam_multiple_iii_better""

This reverts commit 98ceb787862e62feb11f7aee3aa1e1afd842bcb4.
Revert "Revert "Adjusted comment.""

This reverts commit 91370aac2cba6a953dede6755e33c0c683757571.
Revert "Revert "Revert "Merge branch 'sam_multiple_index_writes' into sam_multiple_iii_better"""

This reverts commit 70412e6ab2d2202999f40a33fa4f76de9f927877.

Conflicts:

	src/buffer_cache/alt/page_cache.hpp
Revert "Revert "Revert "Revert "Merge branch 'sam_multiple_index_writes' into sam_multiple_iii_better""""

This reverts commit 48a6864992d9be625e4ffcda8a4b669e36799646.
Merge branch 'sam_multiple_iii_better' into sam_multiple_index_writes
Merge branch 'sam_multiple_index_writes' into next