Fix trailing whitespace

Merge pull request B-Lang-org#284 from krame505/generics

Implement and use a generics mechanism based on GHC.Generics

The merged commits include the following changes:
* Add a Generic typeclass and associated data types/constructors for generic representations
* Define Generic instances in the library for some primitive types
* Automatically derive Generic instances for all types (that don't already have an instance)
* Replace the previous auto-derived classes (Uninitialized, Undefined, DeepSeqCond) with Generic-based implementations
* Workaround the problems with polymorphic fields by auto-generating a wrapper type
* Introduce SPolyWrap as a new struct subtype, for the generated wrapper types
* Add 'internal' property on the generated wrapper types, to hide them in bluetcl queries
* Remove now-unneeded 'forbidsRecursiveInstance' and friends (and obsolete the error tag)
* Add a CShow library implemented with Generic
* Add WExperimental warning for use of Generic class in a context (reported in CtxRed)

Guard e ++ (if c thn _) optimizations when there can be implicit cond…

…itions.