Made RSI comment about get_block_size.
Added RSI about removing block-size-less get_data_read.
Replaced KSI with RSI about get_data_read calls in blob.cc.
Removed blob prepend operation.
Removed the "big_offset" field in the blob structure.
Removed new_offset parameter of allocate_to_dimensions.
Made traverse_to_dimensions not take old_offset or new_offset parameters.
Removed dumb variables in traverse_to_dimensions.
Made traverse logic not take offsets (which are always zero).
Removed weird mysterious memmove operation.
Removed a vestigial highest_i variable.
Merge branch 'next' into sam_2130
Merge branch 'next' into sam_2130
Merge branch 'next' into sam_2130
Added the buf_ptr type.
Removed RSI comment about removing a scoped_malloc_t constructor.
Added a comment about buf_ptr wasting space.
Made buf_ptr be designed to hold the actual ser block size -- no overallocated blocks allowed.
Renamed room_to_grow to reserved, added a handy release function.
Made buf_ptr serbuf_ field in page_t.