removed woraround for calabash issue 102 (p:try sequence output)

ndw/xmlcalabash1#102 was fixed in calabash 1.0.11, so 1.0.11 or newer is now required for xprocspec.
removed woraround for calabash issue 107 (declared error prefix)

ndw/xmlcalabash1#107 was fixed in calabash 1.0.11, so 1.0.11 or newer is now required for xprocspec.
fixed xproc test suite grammar support