[Nitro] [PATCH] Allow multiple joins_many style relationships between two classes (and relevent test case)

[Rob Pitt]

WARNING: This patch causes join tables to be created with different
names and will require you to manually copy join table data into newly
named tables if applied to a project you are already using.

Why would I make a patch that requires this? Not having this requirement
(i.e. doing it in an automated fashion) would be fairly complicated and
a big drain on CPU.

This patch still needs to be implemented at some point because it
enables a desirable behaviour, and we are at 0.2 so we should make
changes with big impacts like this now rather than later.

This is a very minor modification so that a model like this behaves as
it should:

Class Article
  property :title, String

  joins_many :first_join, Category
  joins_many :second_join, Category
  joins_many Category

  def initialize(title)
    @title = title
  end
end

Without this patch, items you push into .first_join are visible
in .second_join and the .categories join (all other combinations of this
are also true).

This is wrong, and this patch corrects this.
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