Check if precipitation is probably in mm/d

[raoulcollenteur]

Short Description

Simple but I think powerful check to see if precipitation may be provided in m/d instead of mm/d for the nonlinear recharge models, which is a common mistake causing issues. Also improved docs on this.

Checklist before PR can be merged:

• closes issue [ENHANCEMENT] Throw warning if recharge flux looks like m/d #609
• is documented
• Format code with Black formatting
• tests added / passed

[codacy-production]

Coverage summary from Codacy

Merging #618 (5a5c6f6) into dev (aee5246) - See PR on Codacy

Coverage variation	Diff coverage
❌ -0.02% (target: +0.00%)	33.33%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (aee5246)	5135	3717	72.39%
Head commit (5a5c6f6)	5138 (+3)	3718 (+1)	72.36% (-0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#618)	3	1	33.33%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[dbrakenhoff]

Some typos and suggestions for slightly clearer documentation/messages.

Otherwise good to go!

[raoulcollenteur]

Thanks for the quick review, just made the changes and I will merge after all checks are passed :)