1.0.29.38: better DESCRIBE

1.0.29.38: better DESCRIBE

* Rework DESCRIBE for more comprehensive reporting and
  easier to read output.

* Delete src/pcl/describe.lisp, no PCL leftovers in the new DESCRIBE
  except for some heritage in DESCRIBE-INSTANCE.

* Fix COMPILED timestamps: we want both internal-real and universal
  time for different use-cases. (Though I'm not sure if we really care
  about the COMPILED timestamps that much, especially now that I
  unilaterally removed their printing from DESCRIBE.)

* Give primitive type transform functions the lambda-list of the type.