(meta-indent-calculate-last): Remove.

(meta-indent-calculate-last): Remove.
(meta-indent-current-nesting): Use a computation of the nesting instead.
(meta-indent-current-indentation): Indentation is given according to
nesting and if the previous line was finished or not.
(meta-indent-unfinished-line): Tell if the current line ends with a
finished expression.
(meta-indent-looking-at-code): Like `looking-at', but checks if the
point is a string before.
(meta-indent-level-count): Use it.  Don't count parenthesis as it's
done in the nesting function.
(meta-indent-in-string-p): Tell if the current point is in a string.
(meta-indent-calculate): Treat b-o-b as a special case.  Use the
previous functions.