This example shows how to use both std::string and std::wstring in Ocaml,
and also demonstrates that one might use this to make a locale-obedient
Ocaml program.

These are two sample runs; note that the output is different based on the 
locale chosen to perform the conversion to wchar_t.

bash-2.05a$ ./example ja_JP.EUC-JP
the original string contains 2              
the new string contains 1 : [ 29494; ]
bash-2.05a$ ./example en_US
the original string contains 2
the new string contains 2 : [ 205; 177; ]