Restructure amount

[rays22]

• Created a quantitative branch.
• Moved amount under this.
• Made concentration a child of amount.
• Removed reciprocal relation to ‘has number of’.
• Make has number of a child of amount.

If applied, this commit will fix #554.

[rays22]

Quantitative data are data represented numerically, including anything that can be counted, measured, or given a numerical value." https://www.nnlm.gov/guides/data-glossary/quantitative-data Possibly we could adapt this to "a quality of an entity that can be represented numerically, including anything that can be counted, measured, or given a numerical value" This could then be used as a model to define the qualitative branch ""a quality of an entity that is descriptive or observational, typically not represented numerically" https://libguides.macalester.edu/c.php?g=527786&p=3608639 https://www.ncbi.nlm.nih.gov/books/NBK470395/ Defining qualitative wasn't part of this ticket but would be good to do.

Thanks @sbello , 1.I have updated the text or the definition of 'quantitative', and

2. added the definition to 'qualitative' that you suggest.

[sbello]

@rays22 please add the xrefs to the definitions for quantitative and qualitative so we can track where these came from (links in previous comment)