eliminate superfluous casting "redundant cast to the same type" (#212)

eliminate superfluous casting "redundant cast to the same type" (#212)

* eliminate superfluous casting "redundant cast to the same type"

this was based on clang-tidy google-readability-casting check,
but only for the Message redundant cast to the same type.
Some hand manipulation of literals was done before clang-tidy.
Some fixes were rejected for portability.

* eliminate a couple casts of integer literals to double.

* a few more casts of integer literals.