(ada-get-indent-*, ada-indent-current, ada-goto-*,

(ada-get-indent-*, ada-indent-current, ada-goto-*,
ada-indent-newline-indent): Rewritten to support the new indentation
scheme
(ada-case-read-exceptions, ada-create-case-exceptions):
New functions
(ada-fill-comment-paragraph): Add support for the
justification parameter
(ada-make-body, ada-gen-treat-proc,
ada-make-subprogram-body): Rewritten to benefit from the gnatstub
external program