Plucene::Analysis::CharTokenizer - base class for character tokenisers

	# isa Plucene::Analysis::Tokenizer

	my $next = $chartokenizer->next;

This is an abstract base class for simple, character-oriented tokenizers.

This should be defined in subclasses.

This will normalise the character before it is added to the token.

	my $next = $chartokenizer->next;

This will return the next token in the string, or undef at the end of the string.