Version 1.102 (other changes not in last commit)

Version 1.102 (other changes not in last commit)
* btree.lisp: New file providing binary tree search for
  sorted vectors
* tests.list: Add tests for binary tree search
* mop.lisp: Change pushed cl:*features* to be in KMRCL
  package, not KEYWORD
* attrib-class.lisp: Use new mop *feature* names for reader
  conditionals
* io.lisp: Add def-unsigned-int-io, along with function
  definitions for binary io of 2 through 8 byte unsigned ints.