Claim updates via publish require superfluous paramaters

[kauffj]

When performing a claim update via publish, only the parameters changing (plus a value to identify the claim), should be required.

Currently, publish requires many parameters even if they are not changing. This results in extra engineering effort at the application level.

As an example, spee.ch currently requests data from the daemon simply to pass it back to the daemon. This is rather absurd.

[daovist]

spee.ch could/should be storing this data when it saves a claim but it would be nice to avoid having to pass source data when updating existing claims, if possible

the code in question is still getting cleaned up but it gets used as follows:

publishParams['sources'] = fullClaim.claim.value.stream.source;

where publishParams is what will be sent in the request and fullClaim is the result of a resolve call to the daemon

[lyoshenka]

closing in favor of #1823