void Guess.setalpha(string* path)
Function used to reset the alphabet to another value. Mainly used in constructor.
Alphabet to use, if the text correspond to a valid file, the content of the file is used to generate the alphabet. If it is not a valid file, the content of the string is used. The format is a 64 lines text file with similar characters grouped on the same line.
This operation invalidates the dictionary, whom should be discarded and rebuilt to ensure proper operations in the library.