Update Case Detail View: Product Systems and Usage Prices

index.html:
Added step="0.01" min="0" to input#lblPricingUsageUnitActualPrice

index.view.js:
Update currency displays for Case Detail View with regard to Usage
Pricing

webops.database.js:
Added $.log() to caseDetailFull for TDD

webops.synchronize.js:
Update caseDetailFull.save()'s externalItemsData map to reference
correct externalItemsData[n] and remove total.

webops.tools.js:
String.currency_to_float() - Filter various strings dealing with floats
that may contain characters other than numbers or periods.
String.number_to_currency() - convert numbers to floats (n.00)