math.complex: fix log(), replace tests

[tankf33der]

Incorrect handling of WolframAlpha parameters and mathematical notation led to the error not being detected during development and testing.

Some systems have the base as the first parameter of the function.

vlang has it second:

Great mpmath has it second too and with correct formula:

But WolframAlpha has it first:

Had to remove all current tests and replace them with one that is consistent with cmath from the Python distribution and the mpmath library.

p.s. I wrote tests for the entire complex module against complex.h file for the functions that match, and other functions are awaiting their turn for manual testing.

[tankf33der]

I will handle this errors.

[tankf33der]

The test showed that comparing f64 using == is a bad idea, which is natural and would depend on the system. Therefore, this also needs to be replaced in the future.

[spytheman]

Good find. Thank you @tankf33der 🙇🏻 .