Rename allowcomments to ignorecomments

[KwatMDPhD]

The argument name suggests opposite behavior and can be confusing.

[bkamins]

As you noted in #1602 this functionality is deprecated. In particular it is OK if someone wants to maintain it as a separate project. Our objective is to remove it from DataFrames.jl codebase, because it is not a part of what needs to be in DataFrames.jl package (having multiple ancillary functionalities in DataFrames.jl was needed in the past when the package ecosystem was not as mature, but now we tend to have one package provide only one consistent set of functionalities).

Therefore, as it was mentioned in the comment #1602 (comment), please feel free to take the codes of readtable/writetable and make a package of them if you wish.

[nalimilan]

Therefore, as it was mentioned in the comment #1602 (comment), please feel free to take the codes of readtable/writetable and make a package of them if you wish.

Better file issues against CSV.jl. We really don't need an additional CSV parsing package in the ecosystem.