Similar to `vector/_first`, this didn't check for the empty vector case, so I've changed it to return `:ignore-instruction` in that case.
There's a lot of duplication between `_first` and `_last`, which makes me think there's some refactoring opportunities.
The original version just used the built-in `first`, which returns `nil` if you give it an empty collection, which is almost certainly not a useful behavior.
This changes it to return `:ignore-instruction` if the vector is empty, thereby leaving all the stacks unchanged.
`make-instruction` will ignore any instructions that return `:ignore-instruction`. This allows instructions to be skipped without consuming their arguments.
There were two independent bugs in `vector/_subvec` that were turned up by our `test.check` testing.
The first was that the order of the arguments was wrong and `stop-raw` and `start-raw` were flipped.
The second was that `stop` wasn't max'ed with 0, which meant it could sometimes be negative, leading to an `IndexOutOfBoundsException`.
The `random-int` function in both `number-io` and `smallest` subtracted a floating point value (`100.0`), which means they were both _actually_ returning a float instead of an int.
This removes both of the ".0"s so that they return integers as advertised.
Adding the ability for the user to modify the UMAD rate that controls the addition and deletion rates and the ability to specify the percentages of new individuals created bu UMAD or crossover
