units

As per angularsen/UnitsNet#328 (comment)

Having a set of tests to validate that the correct abbreviation notations and symbols are used would be helpful, as we have seen from before that discrepancies tend to creep in over time.

See #328 for the (currently work in progress) guideline, go through the comments and identify what tests to write for the guid

A custom generator for systems documentation. It should parse the system definition and generate a custom page according to our requirements.

The output should list:

• dimension definition and a coherent unit
• quantity alias with a default representation type
• all the units with their UDLs and constants

It came up in #41 that it would be nice to have functions like abs(), sqrt(), etc. implemented on $System<f64, U> (and friends) directly, and not just through traits, so that they could be called without the traits in scope.

No Unit found is not descriptive at all.

We should at least make that error message more clear for cases like:

• "75kg" instead of "75 kg"

Our assumption for parsing a compound quantity is that there will be a space character between the value and the unit