mark STDEVP as unsupported
ZSS-269 error evaluating some financial formulas

h3. Root Cause:
Missing optional arguments ({{MissingArgEval}}) causes throwing a
runtime exception.


h3. Solution:
When an error happens during evaluating a formula, we shall throw
EvaluationException with a proper message.
Because callers will handle EvaluationException properly.

We also catch all exceptions and set the evaluation result to
{{#VALUE!}} instead of throwing them.
ZSS-269 error evaluating some financial formulas
fine tune. Provide more informations when handling a exception.
ZSS-269 error evaluating some financial formulas
change cell format setting to eliminate format difference of evaluation
result, and financial test cases can pass.
* do not test some test cases for NETWORKDAYS, WORKDAY for now
* remove test case in first sheet
* verify unsupported formula with #NAME? or #VALUE!
* refactor
Merge branch '3.0' of https://github.com/zkoss/zkspreadsheet.git into 3.0