* Remove deprecated PanicXXX functions from codebase
As per discussion over
[here](https://github.com/tendermint/tendermint/pull/3456#discussion_r278423492),
we need to remove these `PanicXXX` functions and eliminate our
dependence on them. In this PR, each and every `PanicXXX` function call
is replaced with a simple `panic` call.
* add a changelog entry
* Initial commit for 3181..still early
* unit test updates
* unit test updates
* fix check of dups accross updates and deletes
* simplify the processChange() func
* added overflow check utest
* Added checks for empty valset, new utest
* deepcopy changes in processUpdate()
* moved to new API, fixed tests
* test cleanup
* address review comments
* make sure votePower > 0
* gofmt fixes
* handle duplicates and invalid values
* more work on tests, review comments
* Renamed and explained K
* make TestVal private
* split verifyUpdatesAndComputeNewPriorities.., added check for deletes
* return error if validator set is empty after processing changes
* address review comments
* lint err
* Fixed the total voting power and added comments
* fix lint
* fix lint
* set the accum of a new validator to (-total voting power):
- disincentivize validators to unbond, then rebon to reset their
negative Accum to zero
additional unrelated changes:
- do not capitalize error msgs
- fix typo
* review comments: (re)capitalize errors & delete obsolete comments
* More changes suggested by @melekes
* WIP: do not batch clip (#2809)
* substract avgAccum on each iteration
- temporarily skip test
* remove unused method safeMulClip / safeMul
* always substract the avg accum
- temp. skip another test
* remove overflow / underflow tests & add tests for avgAccum:
- add test for computeAvgAccum
- as we substract the avgAccum now we will not trivially over/underflow
* address @cwgoes' comments
* shift by avg at the end of IncrementAccum
* Add comment to MaxTotalVotingPower
* Guard inputs to not exceed MaxTotalVotingPower
* Address review comments:
- do not fetch current validator from set again
- update error message
* Address a few review comments:
- fix typo
- extract variable
* address more review comments:
- clarify 1.125*totalVotingPower == totalVotingPower + (totalVotingPower >> 3)
* review comments: panic instead of "clipping":
- total voting power is guarded to not exceed MaxTotalVotingPower ->
panic if this invariant is violated
* fix failing test
* crypto/merkle: Remove byter in favor of plain byte slices
This PR is fully backwards compatible in terms of function output!
(The Go API differs though) The only test case changes was to refactor
it to be table driven.
* Update godocs per review comments
