Energy prefixes (#3019)

* Enable short and long prefixes for the erg unit of energy

* Use long prefixes instead of short for the joule unit of energy

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Co-authored-by: Jos de Jong <[email protected]>

Author: costerwi

src/type/unit/Unit.js

@@ -2452,14 +2452,14 @@ export const createUnitClass = /* #__PURE__ */ factory(name, dependencies, ({
     joule: {
       name: 'joule',
       base: BASE_UNITS.ENERGY,
-      prefixes: PREFIXES.SHORT,
+      prefixes: PREFIXES.LONG,
       value: 1,
       offset: 0
     },
     erg: {
       name: 'erg',
       base: BASE_UNITS.ENERGY,
-      prefixes: PREFIXES.NONE,
+      prefixes: PREFIXES.SHORTLONG, // Both kiloerg and kerg are acceptable
       value: 1e-7,
       offset: 0
     },