New functionality for conditional validation errors

[elimillera]

Per #78, Add argument to not error out if dataset validation fails.

Fairly simple, just adding a new argument and an if else statement

[bms63]

I'm a broken record today, but can we get a entry in News.md please! :)

[ddsjoberg]

Hello @elimillera ! Thank you for preparing this PR! Everything here looks perfect to me.

My only suggestion would be that we may not need an argument for this at all. I think to warn users it totally sufficient in this case. I don't know a situation where I need xportr to error due to sometimes minor non-adherence to all ADaM standards. But if someone does, they could always set options(warn=2) which treats warnings as errors.

Thanks again!

[elimillera]

Thanks @ddsjoberg that's a really good point. I think sticking with the pattern of our other functions I would vote to keep the argument but I think changing the default to false is a better way to handle it. I think the arguments are useful if these is being used in a more automated pipeline where you want to stop execution if there are any issues like that in the output of the xpt file.

[bms63]

Just a couple wordsmithing comments

[bms63]

LGTM!