Add require_parent and check_exists as options

[Cedric-LG]

Add require_parent and check_exists as options when creating an array

This option allows the user to skip the test that check whether the parent group of an array already exists and whether the array or group itself already exist. Based on Issue #460 #

TODO:

• [ ] Add unit tests and/or doctests in docstrings
• [ ] Add docstrings and API docs for any new/modified user-facing classes and functions
• [ ] New/modified features documented in docs/tutorial.rst
• [ ] Changes documented in docs/release.rst
• [ ] Docs build locally (e.g., run tox -e docs)
• [ ] AppVeyor and Travis CI passes
• [ ] Test coverage is 100% (Coveralls passes)

[pep8speaks]

Hello @Cedric-LG! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers:

Comment last updated at 2019-08-09 13:01:18 UTC

[alimanfoo]

Hi @Cedric-LG, just to say the PR looks great, I'll look at adding some tests.

[alimanfoo]

Just to refresh here, I still think this would be a useful change, just needs some tests.

[blackpandan]

hello is anyone still working on this issue

[joshmoore]

Hi @blackpandan. Let's see if we hear anything from @Cedric-LG, but even if we do, your help in rebasing this PR to fix the conflicting files would already be wonderful! If you decide to work on that, feel free to open a new PR with any work.