Revision 3590

NKSP: Implemented common real number math functions.

* Added built-in real number functions "round()", "ceil()", "floor()",
  "sqrt()", "log()", "log2()", "log10()", "exp()", "pow()", "sin()",
  "cos()", "tan()", "asin()", "acos()", "atan()".

* Added built-in script real number constant "~NI_MATH_PI".

* Added built-in script real number constant "~NI_MATH_E".

* Added NKSP test cases for built-in functions "round()", "ceil()",
  "floor()", "sqrt()", "log()", "log2()", "log10()", "exp()", "pow()",
  "sin()", "cos()", "tan()", "asin()", "acos()", "atan()".

* Bumped version (2.1.1.svn14).