Add the new test suite.

This test suite has been in use for a long time now, in place of the obsolete and unmanageable testparser.py and testfuncs.py. It verifies the complete optimizer output to stdout and stderr, to ensure that the output matches the expectations.

See unit_tests/README.txt for more info.

unit_tests/expr.suite/sort.lsl

@@ -0,0 +1,33 @@
+llListSort([<1.,2.,3.,4.>,<2.,3.,4.,5.>,<5.,4.,3.,2.>,<0.,-1.,-2.,-3.>,
+              <4.,3.,2.,1.>,<3.,2.,1.,0.>],1,0)
++ "********"
++ llListSort([<1.,2.,3.,4.>,<2.,3.,4.,5.>,<5.,4.,3.,2.>,<0.,-1.,-2.,-3.>,
+              <4.,3.,2.,1.>,<3.,2.,1.,0.>],1,1)
++ "********"
++ llListSort([<1.,0.,0.>,<0.,3.,0.>,<0.,0.,1.>,<3.,0.,0.>],1,1)
++ "********"
++ llListSort([2,0,1,1,2,2,2,3,2,4,1,5,2,6], 2, 1)
++ "********"
++ llListSort([2,0,1,1,2,2,2,3,2,4,1,5,2,6], 2, 0)
++ "********"
++ llListSort([2,0,1,1,2,2,2,3,2,4,1,5,2,6,3], 2, 1)
++ "********"
+  // NaN in sort behaves strangely. Also when inside vectors.
++ llListSort([-1., 9., 3., 2., (float)"NaN", 5., 1.],1,1)
++ "********"
++ llListSort([<2.,0.,0.>,<1.,(float)"NaN",0.>],1,1)
++ "********"
++ llListSort([<1.,(float)"NaN",0.>,<2.,0.,0.>],1,1)
++ "********"
++ llListSort([<2.,0.,0.>,<1.,(float)"NaN",0.>],1,0)
++ "********"
++ llListSort([<1.,(float)"NaN",0.>,<2.,0.,0.>],1,0)
++ "********"
+  // This proves that it does not sort by UTF-16 words, but by code points.
+  // Otherwise u"\U0001d41a" would be before u"\ufb01" (because the UTF-16
+  // of u"\U0001d41a" is 0xD835 0xDC1A)
++ llListSort(["fi","á", "𝐚", "a"],1,1)
++ "********"
++ llListSort([2, "B", "C", 3, 1, "A"], 1, TRUE)
++ "********"
++ llListSort([2, "B", "C", 3, 1, "A"], 1, FALSE)