support for Ypsilon Scheme

[christoff-buerger]

This enhancement is about supporting Ypsilon Scheme (cf. GitHub repository); to that end, the installation and execution scripts introduced in issues #44/#82 have to be extended.

Since Ypsilon claims to be R6RS conformant, this should be no problem.

[christoff-buerger]

Ypsilon 0.9.6-trunk/r506 passes all tests, except one. The examples/correct/closures.siple test of SiPLE (examples/siple) fails with:

error: Assertion Failed!

backtrace:
  0  (apply value node args)
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 532
  1  (f pos (ast-child pos n))
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 1470
  2  (when (<= pos ub) (f pos (ast-child pos n)) (set! pos (+ pos 1)) (loop))
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 1469
  3  (lambda () #f)
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 1466
  4  (apply value node args)
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 532
  5  (apply value node args)
  ..."/Users/cbuerger/Documents/development/racr/examples/siple/../../racr/../racr/core.scm" line 532
  6  (siple-interpret program)
  ..."/Users/cbuerger/Documents/development/racr/tests/../examples/siple/execute.scm" line 19

I close the issue for now; this is no important test. I will investigate it and, if there is need, open a separate issue.