prefix most quaternion functions in base with 'q', make them a bit more unique in the namespace when using import *

doco update

Author: petercorke

spatialmath/base/__init__.py

@@ -185,27 +185,27 @@
     "isvectorlist",
 
     # spatialmath.base.quaternions
-    "pure",
+    "qpure",
     "qnorm",
-    "unit",
-    "isunit",
-    "isequal",
+    "qunit",
+    "qisunit",
+    "qisequal",
     "q2v",
     "v2q",
     "qqmul",
-    "inner",
+    "qinner",
     "qvmul",
     "vvmul",
     "qpow",
-    "conj",
+    "qconj",
     "q2r",
     "r2q",
-    "slerp",
-    "rand",
-    "matrix",
-    "dot",
-    "dotb",
-    "angle",
+    "qslerp",
+    "qrand",
+    "qmatrix",
+    "qdot",
+    "qdotb",
+    "qangle",
     "qprint",
 
     # spatialmath.base.transforms2d