* swarm/storage/localstore: most basic database

* swarm/storage/localstore: fix typos and comments

* swarm/shed: add uint64 field Dec and DecInBatch methods

* swarm/storage/localstore: decrement size counter on ModeRemoval update

* swarm/storage/localstore: unexport modeAccess and modeRemoval

* swarm/storage/localstore: add WithRetrievalCompositeIndex

* swarm/storage/localstore: add TestModeSyncing

* swarm/storage/localstore: fix test name

* swarm/storage/localstore: add TestModeUpload

* swarm/storage/localstore: add TestModeRequest

* swarm/storage/localstore: add TestModeSynced

* swarm/storage/localstore: add TestModeAccess

* swarm/storage/localstore: add TestModeRemoval

* swarm/storage/localstore: add mock store option for chunk data

* swarm/storage/localstore: add TestDB_pullIndex

* swarm/storage/localstore: add TestDB_gcIndex

* swarm/storage/localstore: change how batches are written

* swarm/storage/localstore: add updateOnAccess function

* swarm/storage/localhost: add DB.gcSize

* swarm/storage/localstore: update comments

* swarm/storage/localstore: add BenchmarkNew

* swarm/storage/localstore: add retrieval tests benchmarks

* swarm/storage/localstore: accessors redesign

* swarm/storage/localstore: add semaphore for updateGC goroutine

* swarm/storage/localstore: implement basic garbage collection

* swarm/storage/localstore: optimize collectGarbage

* swarm/storage/localstore: add more garbage collection tests cases

* swarm/shed, swarm/storage/localstore: rename IndexItem to Item

* swarm/shed: add Index.CountFrom

* swarm/storage/localstore: persist gcSize

* swarm/storage/localstore: remove composite retrieval index

* swarm/shed: IterateWithPrefix and IterateWithPrefixFrom Index functions

* swarm/storage/localstore: writeGCSize function with leveldb batch

* swarm/storage/localstore: unexport modeSetRemove

* swarm/storage/localstore: update writeGCSizeWorker comment

* swarm/storage/localstore: add triggerGarbageCollection function

* swarm/storage/localstore: call writeGCSize on DB Close

* swarm/storage/localstore: additional comment in writeGCSizeWorker

* swarm/storage/localstore: add MetricsPrefix option

* swarm/storage/localstore: fix a typo

* swamr/shed: only one Index Iterate function

* swarm/storage/localstore: use shed Iterate function

* swarm/shed: pass a new byte slice copy to index decode functions

* swarm/storage/localstore: implement feed subscriptions

* swarm/storage/localstore: add more subscriptions tests

* swarm/storage/localsore: add parallel upload test

* swarm/storage/localstore: use storage.MaxPO in subscription tests

* swarm/storage/localstore: subscription of addresses instead chunks

* swarm/storage/localstore: lock item address in collectGarbage iterator

* swarm/storage/localstore: fix TestSubscribePull to include MaxPO

* swarm/storage/localstore: improve subscriptions

* swarm/storage/localstore: add TestDB_SubscribePull_sinceAndUntil test

* swarm/storage/localstore: adjust pull sync tests

* swarm/storage/localstore: remove writeGCSizeDelay and use literal

* swarm/storage/localstore: adjust subscriptions tests delays and comments

* swarm/storage/localstore: add godoc package overview

* swarm/storage/localstore: fix a typo

* swarm/storage/localstore: update package overview

* swarm/storage/localstore: remove repeated index change

* swarm/storage/localstore: rename ChunkInfo to ChunkDescriptor

* swarm/storage/localstore: add comment in collectGarbageWorker

* swarm/storage/localstore: replace atomics with mutexes for gcSize and tests

* swarm/storage/localstore: protect addrs map in pull subs tests

* swarm/storage/localstore: protect slices in push subs test

* swarm/storage/localstore: protect chunks in TestModePutUpload_parallel

* swarm/storage/localstore: fix a race in TestDB_updateGCSem defers

* swarm/storage/localstore: remove parallel flag from tests

* swarm/storage/localstore: fix a race in testDB_collectGarbageWorker

* swarm/storage/localstore: remove unused code

* swarm/storage/localstore: add more context to pull sub log messages

* swarm/storage/localstore: BenchmarkPutUpload and global lock option

* swarm/storage/localstore: pre-generate chunks in BenchmarkPutUpload

* swarm/storage/localstore: correct useGlobalLock in collectGarbage

* swarm/storage/localstore: fix typos and update comments

* swarm/storage/localstore: update writeGCSize comment

* swarm/storage/localstore: global batch write lock

* swarm/storage/localstore: remove global lock option

* swarm/storage/localstore: simplify DB.Close