BPjsExceptions: Tidy up, add runtime location data

[michbarsinai]

e.g. file, line, column.

Specifically: HandleWrapopedException in BProgramJsProxy class throws error location data on the conversion of WrappedException to BPJSException. Should probably use a rhino exception to get the location data and stack trace.

[michbarsinai]

Deferred to later. However, the handleWrappedException method is in the BPEngineTask class, NOT in BProgramJsProxy.