Improve llFrand.

- Remove it from lslextrafuncs, and move all the code to lslbasefuncs.
- Make it behave like SL's more accurately. Denormals return 0 always in SL.
- Use int() for truncation rather then floor/ceil.
- Add test cases.

lslopt/lslextrafuncs.py

@@ -17,11 +17,10 @@
 
 # Extra functions that have predictable return values for certain arguments.
 
-import lslcommon
 from lslcommon import Key #, Vector, Quaternion
 from lslbasefuncs import ELSLCantCompute, isinteger, iskey, islist, \
-  isfloat, isvector, isstring, NULL_KEY, ZERO_VECTOR, ZERO_ROTATION, cond
-#isrotation
+  isvector, isstring, NULL_KEY, ZERO_VECTOR, ZERO_ROTATION, cond
+#isfloat, isrotation
 
 TouchEvents = ('touch', 'touch_start', 'touch_end')
 DetectionEvents = ('touch', 'touch_start', 'touch_end',
@@ -147,13 +146,6 @@ def llEdgeOfWorld(v1, v2):
         return 1
     raise ELSLCantCompute
 
-if not lslcommon.IsCalc:
-    def llFrand(f):
-        assert isfloat(f)
-        if f == 0:
-            return 0.
-        raise ELSLCantCompute
-
 def llGetAgentInfo(id):
     assert iskey(id)
     if not cond(id):