Replace the tests for elsa-make-type comparing to vectors with comparing to print representation

[Fuco1]

Because different versions of emacs use different representation of objects (vectors before 26 and records after 26) half the tests fails.

We can kill two birds with one stone by testing that whatever type the macro produces serializes back to the form that created it, such that reading it back would produce the same type.

However, we need to take into account normalization of nested parens, such that (Int) and Int are equivalent even though the form is different (both will print as Int)

This was discovered in #20.