Made page_cache_t keep its own copy of max_block_size.
Made serializer_t::allocate_buffer be a static method.
Merge branch 'next' into sam_max_block_size

Conflicts:
	src/buffer_cache/alt/page.cc
Fixed compilation error caused by merge conflict.
Merge branch 'next' into sam_max_block_size
Merge branch 'sam_max_block_size' into next