This is related to issue #3741 where fetching data from
invalid store, package panic.
Modify subspace.go to return errors instead of panic.
Also update other packages that import subspace and
handle errors.
* Remove shares concept from unbonding and redelegation
* Remove redundant staking REST type declerations
* Rename staking REST request types
* Fix slashing tests
* Fix staking tests
* Fix integration tests
* Add safety checks for when validator tokens are zero
* Attempt to fix simulation
* Add pending log entry
* Update docs
* Implement and use SharesFromTokens
* Rename ShareTokens and ShareTokensTruncated
* Rename Delegation to Amount in DelegateRequest
* Implement and use SharesFromTokensTruncated
* Update MsgDelegate to use Amount instead of Value
* Use constructors in staking sim messages
* Implement and use ValidateUnbondAmount
* Fix tag usage in handlers and EndBlocker
* Prepend action tag in baseApp
* Fix LCD
* Remove unnecessary conversion
* Fix invalid consensus pubkey in CLI tests
* Fix tag usage in cli_test
* Shorten bechify in test
* Update docs and PENDING
* Update slashing import/export
* More slashing.WriteGenesis
* Add test import/export to CI
* Store equality comparison.
* Fix validator bond intra-tx counter
* Set timeslices for unbonding validators
* WriteGenesis => ExportGenesis
* Delete validators from unbonding queue when re-bonded
* Hook for validator deletion, fix staking genesis tests
* pulling in stuff from fee-distr PR
* revert some gov changes
* fix using cons address, also remove old commented distr code
* doc update
* val comments
* remove GetValidatorByConsPubKey
* Add new account bech32 prefixes with godocs
* Restructure spacing of existing account code
* Update account godocs
* More account godoc updates + new tm pub/addr helpers
* Update validator type to use new account types/bech32 prefixes
* Fix account documentation errors
* Update Bech32 prefix for consensus nodes
* Update Bech32 spec doc
* Fix account type tests
* Add missing account consensus functions, clear up godocs, and fix tests
* Add to TestRandBech32PubkeyConsistency check
* Update initialization of validator public keys
* Update query signing info command
* Implement new ConsAddress type with associated unit tests
* [WIP] Update stake and slashing parameters
* Update all calls to MustBech32ifyValPub
* [WIP] Validator operator API updates
* [WIP] Fix and update unit tests
* Fix gov logs (helping to debug failing tests)
* Fix gov tally
* Fix all broken x/ unit tests
* Update gaia app genesis address logic
* Fix linting errors
* Fix broken LCD tests
* Fix broken CLI tests
* Implement command to get validator address and pubkey from key name
* Add support for getting validator key information via REST endpoint
* Update PENDING log
* Update docs
* Revert GaiaGenTx.PubKey bech32 prefix
* Fix broken docs and cli tests
* Update genesis to use correct Bech32 (cons) prefix for pubkeys
* Update docs and unit tests to reflect new cosmos account bech32 prefix
* minor formatting