optimized increment, decrement

added validity checking
added range, less, log10, and of course, many tests


[SVN r12299]

tools/build

@@ -1 +1 @@
-Subproject commit ca0902c3c6b6ff7f4d9feaca81b7ecb30b97df2c
+Subproject commit c3125d3a325d106b7460e21b179104e20339d058