ezhil_scanner - tokenizer should break at ^
calc_asmd.n - test case to illustrate computing using numbers
hello.n - demo use of exit() function
update calc
update age.n script to get userinput from strings
builtins : add string functions for Ezhil/Exprs
Interpreter : sprintf, printf functions for Ezhil.
ezhil_tests/strings.n : ezhil program to use strings library functions
ezhil_scanner : allow correct termination of the Tamil identifiers
test : add two new demos to testing 4/42 fail now, unlike 4/40 earlier