* refactor output to have internal output identifier
refactor to use AsRef for output identifier
make the output MMR explicit in terms of output identifiers
* put the serde deser back for rangeproof
* add json test for transactions
* use mmr sizes in header to validate block weight given header only
* add global weight validaton to headers when reading them untrusted off the network
* fixup tests, one pending test
* add test for deserializing untrusted block header exceeeding weight limits
* validate header mmr sizes, must grow for each block
* remove redundant height check
* fix tests after rebase
block specific TooHeavy error
* make sure header PMMR is init correctly based on header_head from db
* fix to ensure header PMMR is consistent with header_head in db on chain init
* change order of operations - validate header earlier
and avoid applying header to header PMMR before validation
as this potentially leaves the PMMR in a tricky state to rewind from
* variants for output_pos linked list entries (head/tail/middle/unique)
next and prev and Vec<u8> lmdb keys
* get_pos on enum
* break list and list entries out into separate enums
* track output features in the new output_pos index, so we can determine coinbase maturity
* push entry impl for none and unique
* some test coverage for output_pos_list
* commit
* wip - FooListEntry
* use instance of the index
* linked list of output_pos and commit_pos both now supported
* linked_list
* cleanup and rename
* rename
* peek_pos
* push some, peek some, pop some
* cleanup
* commit pos
cleanup
* split list and entry out into separate db prefixes
* cleanup and add placeholder for pop_back
* pop_pos_back (for popping off the back of the linked list)
test coverage for pop_pos_back
* wip
* placeholder for prune via a trait
pos must always increase in the index
* rewind kernel_pos_idx when calling rewind_single_block
* RewindableListIndex with rewind support.
* test coverage for rewindable list index
* test coverage for rewind back to 0
* rewind past end of list
* add tests for kernel_pos_idx with multiple commits
* commit
* cleanup
* hook NRD relative lock height validation into block processing and tx validation
* cleanup
* set local chain type for kernel_idx tests
* add test coverage for NRD rules in block processing
* NRD test coverage and cleanup
* NRD relative height 1 test
* test coverage for NRD kernels in block processing
* cleanup
* start of test coverage for txpool NRD kernel rules
* wip
* rework pool tests to use real chain (was mock chain) to better reflect reality (tx/block validation rules etc.)
* cleanup
* cleanup pruneable trait for kernel pos index
* add clear() to kernel_pos idx and test coverage
* hook kernel_pos rebuild into node startup, compaction and fast sync
* verify full NRD history on fast sync
* return early if nrd disabled
* fix header sync issue
