a list for one case to test

List elements:

1. id: an integer to use for this category when a case variable is made (default: none, one will automatically be assigned when the case variable is made)

2. name: a character identifier for this case

3. expression: a CrunchLogicalExpr that sets the conditions for the case, or "else"

4. numeric_value: a numeric that is the value this case should take on when analyzing the data numerically (mean, standard deviation, etc.)

5. missing a logical indicating if this case should be treated as missing