Release 1.9.1

• Revision of library (lispkit test) involving procedures test-group-failed-tests, test-group-passed-tests, failed-tests, passed-tests, current-test-epsilon
• Fixed comparison of complex numbers and numbers involving NaN in library (lispkit test)
• Fixed small bugs in (lispkit match) and included support for =.., *.., and **1
• Refactored debugging functionality into library (lispkit debug)
• New libraries: (srfi 194), (srfi 204), (lispkit sxml), (lispkit sxml html), and (lispkit sxml xml)