ASCIIToString (vec)
Convert a vector of ASCII values to a string.
		  See also
		  StringToASCII.
          
Example:
genius> ASCIIToString([97,98,99])
= "abc"
See Wikipedia for more information.
AlphabetToString (vec,alphabet)
Convert a vector of 0-based alphabet values (positions in the alphabet string) to a string.  A null vector results in an empty string.
		  See also
		  StringToAlphabet.
          
Examples:
genius> AlphabetToString([1,2,3,0,0],"abcd")
= "bcdaa"
genius> AlphabetToString(null,"abcd")
= ""
StringToASCII (chaîne)
Convert a string to a (row) vector of ASCII values.
		  See also
		  ASCIIToString.
          
Example:
genius> StringToASCII("abc")
= [97, 98, 99]
See Wikipedia for more information.
StringToAlphabet (chaîne,alphabet)
Convert a string to a (row) vector of 0-based alphabet values
		  (positions in the alphabet string), -1's for unknown letters.
		  An empty string results in a null.
		  See also
		  AlphabetToString.
          
Examples:
genius> StringToAlphabet("cca","abcd")
= [2, 2, 0]
genius> StringToAlphabet("ccag","abcd")
= [2, 2, 0, -1]