Merge pull request #2750 from tendermint/release/v0.26.0

…dation

if some process locks a block in round 0, then 0 is valid proposal.PO…

* mempool: ErrPreCheck and more log info

* change Pre/PostCheckFunc to return errors

also, continue execution when checking txs in mempool_test if
err=PreCheckErr

…ermission errors (#2758)

* only invoke InitWAL/CloseWAL if WalPath is not empty

Closes #2717

* panic if WAL is not initialized when calling CloseWAL

* add a changelog entry

#2756)

* Fix crypto/merkle ProofOperators.Verify to check bounds on keypath parts.

* Update PENDING

This is a follow-up from #2724

Closes #2761

* p2p: peer-id -> peer_id

* update changelog

* dedup with spec/abci/client-server

* fixup abci/readme

* link to getting started in abci/README

* https

* spec/abci: some deduplication

* docs: remove extraneous comment

Fixes #2740

It's OK if the head will grow a little bit bigger, but we'll avoid
panic.

Refs #2703

…mediately after sending pex addrs in seed mode (#2797)

* Require addressbook to only store addresses with valid ID

* Do not shut down peer immediately after sending pex addrs in SeedMode

* p2p: fix #2773

* seed mode: use go-routine to sleep before stopping peer

)

- actually call `ps.SetHasVote` instead to avoid carrying around
`votes.Height()`, `votes.Round()`, `types.SignedMsgType(votes.Type())`

* p2p: re-check after sleeps

* use NodeInfo as an interface

* Revert "use NodeInfo as an interface"

This reverts commit 5f7d055.

* Revert "p2p: re-check after sleeps"

This reverts commit 7f41070.

* preserve dial to itself

* ignore ensured connections while re-connecting

* re-check after sleep

* keep protocol definition on net addresses

* decrease log level

* Revert "preserve dial to itself"

This reverts commit 0c6e0fc.

* correct func comment according to modification

Co-Authored-By: mgurevin <mehmet@gurevin.net>

* fix amino overhead computation for Tx:

- also count the fieldnum / typ3
- add method to compute overhead per Tx
- slightly clarify comment on MaxAminoOverheadForBlock
- add tests

* fix TestReapMaxBytesMaxGas according to amino overhead

* fix TestMempoolFilters according to amino overhead

* address review comments:

 - add a note about fieldNum = 1
 - add forgotten godoc comment

* fix and use sm.TxPreCheck

* fix test

* remove print statement

* changelog and version

* fix changelog