Redundant function `multiply_log` vs. `lmultiply`

[jachymb]

There currently exist two functions multiply_log and lmultiply

They basically do the same thing. IMO they should be consolidated and only one should be kept.

Maybe the other should first get a deprecation warning or something.

[WardBrian]

Multiply_log was deprecated in the language in favor of lmultiply long ago, but I believe the compiler still generates calls to multiply_log in the math library