add 'char=?
add write-char akin to write-byte
Add optional argument for call-with-input/output-file
Merge branch 'master' of github.com:samth/pycket

* 'master' of github.com:samth/pycket: (36 commits)
  Remove experimental code
  Small example for bug.
  this test passes nowadays
  Only test callgraph when enabled
  Fix callgraph test
  Uncomment continuation fusing code * This code causes a performance hit for certain benchmarks
  Have callgraph mark all consuming continuation ASTs
  Add flag to control logging of callgraph operations
  Fixup
  Forgot to remove annotation
  Add toggle switches for the loop detection methods
  Turn off printing of jitting
  Remove useless functions
  Save some things
  Add some constant fields
  Add callgraph stuff to chaperoned procedures
  Remove uses of mark_non_loop in handler functions
  Remove more mark_non_loop functions
  Merge in changes
  Nice printing and some immutable annotations
  ...