Add `findpeaks` as alias for `findmaxima`

[KronosTheLate]

As previously discussed, some users are likely to find findpeaks to be a more natural name than findmaxima. There are likely two potential reasons:

• findpeaks aligns better with the package name "Peaks.jl`
• Other frameworks such as scipy and MATLAB use findpeaks for this functionality.

In my opinion, the second point weighs the most. But the first also makes obvious to me that this is a good idea.

Because findmaxima is already exported, and provides a more explicit distinction between minima (findminima) and maxima, it is useful to keep around. But it would not hurt to export const findpeaks = findmaxima (I think const is good here...?), which would not increase the "surface area" of the source code (no extra docstring, the underlying function is the only function to compile, etc).

[halleysfifthinc]

That would be fine. If we just exported findpeaks as an alias for findmaxima, ?findpeaks pulls up the findmaxima docstring. Do you think that would be confusing, meh, or a good/helpful indicator that there are different kinds of peaks (e.g. minima)?

[KronosTheLate]

I think that should be okay. Perhaps the docstring could start with (Alias: findpeaks). That should make the situation clear, I believe.

[halleysfifthinc]

I'll add the alias when I get the chance; I have some other PR's cooking that are a higher priority.

[KronosTheLate]

Fair enough - thanks for hearing me out ^_^