Add patient copay field

[jkleinsc]

Need a field to track patient responsibility. In the Philippines this field is called Patient counterpart.

[jkleinsc]

While bigger than this issue, when we implement this, we should add ember-i18n so that we can customize the label for the Philippines

[jkleinsc]

#141 is the ticket for internationalization

[tangollama]

@jkleinsc can we close this?

[jkleinsc]

@tangollama I don't think we ever added this field

[wolfieorama]

my proposed plan is to add a field to capture whatever amount the patient
contributes on top of what the other parties take responsibility of.
My thought is to have it as a non-required field handling different currencies (number
type) -- an addon may be to handle different currencies

[taras]

@wolfieorama your plan looks good.

I would suggest that we break this into 2 parts:

1. add this copay number field
2. make it work properly for with currency indicator

For 1, we might want to use the code that was introduced in #668
For 2, we need to figure out how to handle currency across the entire app (we might need a localize currency format)

[jkleinsc]

@wolfieorama the intention is that we add a configuration to set a system wide currency, so any monetary values put into the system would be in that currency. I don't think HospitalRun should try to support multiple currencies in one location.

[wolfieorama]

@jkleinsc @taras I will jump on another issue as that is sorted

[jkleinsc]

I am closing this issue as this enhancement request is satisfied by the custom forms feature.