jack

added to accept environment variable and yaml file for configuration

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## Proposed changes **- Issues** - It is needed to execute the klaytn binaries (kcn, kpn, ken, ...) with environment variable or configuration file. - With this resolution, you can...

## Proposed changes - Added baseFee metric when mining a block in `commitNewWork( )`. - It is for a block producer that do not execute the _insertChain_. - Added baseFee...

To do list about APIs

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- I will update this list continuously - to be deleted - debug_setMutexProfileRate - to be updated - eth_resend - debug_seedHash (should be deprecated, not deleted) - history: https://github.com/klaytn/klaytn/pull/975#discussion_r652268156

I set up the signing server in ubuntu 20.04. with debugging, I figure out in and out filename same in the second "-nest" signing step and error out "Bus error"

## Proposed changes - link placeholder update kaia -> kaiachain

## Proposed changes - link placeholder update kaia -> kaiachain