WIP: Fix mempool PostCheck error bug #290
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PostCheck has a design flaw:
A checktx transaction that passes in the app's checktx state but fails postcheck would still increment the caller's sequence in the app's checktx state, causing an unexpected signature error even for subsequent txs by the same caller, until the next block (which clears the mempool).
The best solution that simplifies Tendermint is the one that moves this check constraint to the app itself, as implemented here.