replaces randsample with a custom-built randSample function and removes range

[alexhroom]

This PR fixes part of #146 by removing the use of range from histp.m and replacing randsample from the Statistical Toolbox with a home-made implementation.

Note that of the six potential operations of randsample, this only implements four:

• randsample(n, k) $\rightarrow$ randSample(n, k) (sample k random integers between 1 and n without replacement)
• randsample(population, k) $\rightarrow$ randSample(population, k) (sample k random items from population without replacement
• randsample(n, k, true, w) $\rightarrow$ randSample(n, k, w) (sample k random integers between 1 and n with replacement, with weights w)
• randsample(population, k, true, w) $\rightarrow$ randSample(population, k, w) (sample k random items from population with replacement, with weights w)

It seems that we never do unweighted sampling with replacement, and randsample does not support weighted sampling without replacement, so I did away with the replacement parameter in randsample.

[DrPaulSharp]

Looks good, there are just a couple of things I'd like you to have a look at please.

[DrPaulSharp]

I don't think argument blocks work at all prior to 2022b unfortunately.

[DrPaulSharp]

All looks good, shame about the arguments block.