Use the short_name variable key by default

[Naomi Parsons (NParsonsMO)]

Closes #489

The variable "tas" in mip table "Amon" was listed in the wrong stream (ap5 but should be in apm), so that has been correctly as part of testing that we can retrieve it from a recipe.

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[Naomi Parsons (NParsonsMO)]

This is the test that shows the new functionality

[Naomi Parsons (NParsonsMO)]

tas should have been in apm stream before, now it's being tested it should be correct.