Speedup code by moving things out of loops

[leouieda]

There were a lot of trig functions being called inside loops. I moved some of them out of the loops for some speedups.

• Benchmark
• All tests pass
• Changelog entry
• Can be merged

[leouieda]

Ran the benchmark (master | speedup):

Computer specs           |  Computer specs
model name  : Intel(R)       |  model name  : Intel(R)
MemTotal:    3950824 kB  |  MemTotal:    3950824 kB
                 |  
Time spent on potential:     |  Time spent on potential:
4.02user 0.00system 0:04.03  |  2.02user 0.00system 0:02.03
0inputs+208outputs (0major+  |  0inputs+208outputs (0major+
                 |  
Time spent on gz:        |  Time spent on gz:
11.66user 0.00system 0:11.6  |  9.04user 0.00system 0:09.05
0inputs+208outputs (0major+  |  0inputs+208outputs (0major+
                 |  
Time spent on gzz:       |  Time spent on gzz:
49.16user 0.03system 0:49.2  |  39.59user 0.02system 0:39.6
0inputs+208outputs (0major+  |  0inputs+208outputs (0major+