* add md files for translation.
* start to translation fast-sync, code_structure. add file build_KR.md, states_KR.md
* add dandelion_KR.md && simulation_KR.md for Korean translation.
* add md files for translation.
* start to translation fast-sync, code_structure. add file build_KR.md, states_KR.md
* add dandelion_KR.md && simulation_KR.md for Korean translation.
* remove some useless md files for translation. this is rearrange set up translation order.
* add dot end of sentence & translate build.md in korean
* remove fast-sync_KR.md
* finish build_KR.md translation
* finish build_KR.md translation
* finish translation state_KR.md & add phrase in state.md to move other language md file
* translate blocks_and_headers.md && chain_sync.md in Korean
* add . in chain_sync.md , translation finished in doc/chain dir.
* fix some miss typos
* start to translate dandelion.md & simulation.md in Korean.
* [WIP] translation
* [WIP] files add.
* [WIP] dandelion simulation
* finish pruning translation
* doc/dandelion translation in Korean finish
* start to translation mmr, merkle, switch commitment in Korean
* [WIP] merkle_KR.md
* finish translation mmr.md & merkle.md
* delete [WIP]switch_commitment_KR.md
* add pow_KR.md for translation
* finish translation grin4bitcoiners
* fix for merge
* fix for merge
* fix for merge
* ,
* POW & grin4bitcoiner.md translated in Korean.
* fix some typo and cargo.lock
* Integrate PMMR and its persistent backend with the Chain
* Chain can set tree roots; PMMR backend discard
* Check spent and prune for each input in new block
* Handling of forks by rewinding the state
* More PMMR tests and fixes, mostly around rewind
* Rewrite get_unspent to use the sumtrees, fix remaining compilation issues
