(ada-prj-add-ada-menu): Remove the map and name parameters.
(ada-prj-display-page, ada-prj-field, ada-prj-initialize-values):
New function
(ada-prj-load-directory, ada-prj-subdirs-of): New functions
(ada-prj-load-from-file): New function
(ada-prj-save): Always save fields that depend on the current buffer
(ada-prj-show-value): New function