Fixed require statement in setDistribution and improved testing coverage

[PeterMPhillips]

Also did npm link on the tps-helpers package which may have caused the errors @topocount was seeing

[chadoh]

One note. I think this should probably change, but I'm not 100% sure, so I'm not marking as "request changes." I'm also not marking as "approved" because I want someone with more contract experience to sign off on this. @topocount @Quazia @ottodevs, can one of you take a look, please?

[ottodevs]

Just a note: web3/allocations is already merged, please don't target that branch again.
I change this to target dev instead.

Edit: After clarifying with @topocount , let's target web3/allocations again

[ottodevs]

Please @PeterMPhillips I am sorry we didn't warn you about this test-helpers messing that probably confused you, that is one of the reasons we are trying to get rid of it, so it is really important to avoid introducing regressions into our codebase by trying to use it again.

If you are experiencing some kind of issue, please ask us to help with that.

I suggest reverting all these changes, rebasing from latest dev taking care of looking at the Allocations.test.js that has the correct test format and imports, and focus into adding the test cases you need on this file... you should not experience any import error then.

Also avoid modifying Allocations.sol since that code is certified and frozen right now... If we find a critical issue on it, I think it is better tell that in our channels and discuss about the fixes before trying to add the change directly.

[ottodevs]

I close here in favour of: #1282
Please, move any work from this PR not present on the above, if there is still something relevant here.

Good work overall! I am sorry but things were a bit messed with the different branches.