Make the from_hex(), from_oct(), and from_bin() methods consistent with
CORE::oct(), which does not require a leading "0" before the letter ("x",
"o", or "b").Make the from_oct() and new() methods accept octal numbers with prefix
"0o", "0O", "o" (lowercase letter o), and "O" (capital letter O).Make the from_bin() and new() methods accept binary numbers with
prefix "0b", "0B", "b", and "B".Make the from_hex() and new() methods accept hexadecimal numbers with
prefix "0x", "0X", "x", and "X".Update test files to match with the above.