Add `unname_dir` and other changes

[pat-s]

• name_chunks() and name_dir_chunks() are now able to unname all chunks before naming them. This ensures a consistent naming for all chunks instead of just labelling unnamed chunks.
• new function unname_dir_chunks() that works in the same way as name_dir_chunks()
• rename unname_all_chunks() to unname_chunks() to be consistend with name_chunks()
• added some cli verbosity
• tidy description
• new argument unname for name_chunks() and name_dir_chunks()
• use roxygen template for new argument unname

NEWS.md needs to be updated with the PR number before merge.

[coveralls]

Pull Request Test Coverage Report for Build 76

• 7 of 10 (70.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.4%) to 94.69%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
R/name_chunks.R	3	6	50.0%
<!--	Total:	7	10	70.0%	-->

Totals
Change from base Build 75:	-2.4%
Covered Lines:	107
Relevant Lines:	113

---

💛 - Coveralls

[maelle]

:wave: @pat-s! Thanks for your PR! We'll get to this PR soon-ish, but after the patch release we'll do to fix CRAN results. Thanks for your patience.

[maelle]

Once the patch release is on CRAN, I'll merge this manually since I created too many conflicts. :-) (local checks ok).

[maelle]

@pat-s thanks a lot! :rocket: And sorry for the delay! :snail:

Side note for future contributions, please open issues first so you're sure to not open an PR for nothing.

[pat-s]

Thanks a lot @maelle!

Side note for future contributions, please open issues first so you're sure to not open an PR for nothing.

Will do!