* 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
* wip
* commit
* add block level validation rule around NRD kernels and HF3 block height
* wip
* test coverage for kernel ser/deser for NRD kernels
* add some type safety around ser/deser of nrd relative height
* cleanup
* cleanup tx sig handling and add tests around NRD kernel sig
* test coverage for chain apply block containing NRD kernel
* verify kernel variants when adding tx to pool
NRD kernels will not be accepted until HF3
* add txpool test for NRD kernel handling
* fix merge
* fix api for NRD kernels
* commit
* wip - feature flag for NRD kernel support
* wip
* global config and thread local feature flag for NRD kernel support
* add feature flag support for NRD kernels
default to false when starting up node
allow it to be set to true in context of individual tests
* feature flag
* explicit testing of NRD kernel via feature flag
* add chain_type and feature flag logging on startup
* PR feedback and cleanup
* PR feedback
* Do not allocate String for static status, use Cow instead, eg we allocate "Running" string at every refresh
* Use static dispatch for Views instead of Box<dyn View>
* Update only the current view
* Simplify Listener trait
* cleanup how we handle key splitting for transaction offset
add test to demonstrate a pair of transaction halves sharing same kernel excess
* cleanup
* cleanup
