Update jAutoCalc.js

new func countNotEmpty - counts number of non empty elements

allows to select elements not only by name but by jQuery selector (.summable for example), it is usefult in built-in functions sum etc

new option emptyAsZero - empty input values treated az 0

new option smartInteger - values 123.000 are converted to 123

new event onShowResult - fired just before value change - allows converting for example -123 to (123)

new options funcs,vars - allow extending by user defined funcs and vars