Add reverse and reverse! functions similar to sort and sort!

[ppalmes]

• there are cases where you just want to reverse the order of dataframe and currently there is no implementation of the reverse() function

[Chandu-4444]

I'm trying to implement this. I wrote a function named reverse and put that in src/abstractdataframe/reverse.jl. But when I try to use my function, it didn't get recognized. But I placed the same function in sort.jl and it worked only that the docstrings I wrote weren't recognized (And they didn't show up during ?reverse). Is there somekind of procedure to create new functions in a module?

[Chandu-4444]

I'm trying to implement this. I wrote a function named reverse and put that in src/abstractdataframe/reverse.jl. But when I try to use my function, it didn't get recognized. But I placed the same function in sort.jl and it worked only that the docstrings I wrote weren't recognized (And they didn't show up during ?reverse). Is there somekind of procedure to create new functions in a module?

I figured out that I need to add the new files that hold usable functions in ModuleName.jl file. This works fine, and now my function is working. But I didn't understand why my docstrings aren't getting shown when I use ?reverse.

Edit: I figured it out! Made a prototype PR #2944

[bkamins]

added in 1.4 release