Quick warning about group in the descriptions
Change style + little fix for grouped_data
Removed unimplemented (and nonsensical) page_t::is_deleted.
Wrapped the destroy_ptr_ bool in page_loader_t.
Made page_t construction defer loading with block id, by only getting the block token, with a catch-up operation when a waiter is added.
Made the_page_for_read_or_deleted load page deferred, others load page for read.
Removed a bunch of now unused cache_account_t parameters.
Removed load_immediately_t and load_deferred_t parameters, since they are redundant with the cache_account_t parameter.
Made page_cache_t keep its own copy of max_block_size.
Made serializer_t::allocate_buffer be a static method.
Merge branch 'sam_just_block_token' into next
Merge branch 'next' into sam_max_block_size

Conflicts:
	src/buffer_cache/alt/page.cc
Fixed compilation error caused by merge conflict.
fixed grouping error messages
improved empty stream error message for min, max, avg
fixed stray newline
Merge branch 'michel_2054_embedded_warning' into next
Merge branch 'next' into sam_max_block_size
Merge branch 'sam_max_block_size' into next
Merge branch 'next' into sam_issue_97

Conflicts:
	src/buffer_cache/alt/page_cache.cc
	src/buffer_cache/alt/page_cache.hpp