__FILE__ and __LINE__ directives to be expanded correctly.
(c-macro-expansion): use a forth optional argument DISPLAY meaning
it should print messages at the start and end of preprocessing.
All callers changed.
(c-macro-expand): Don't display message here.
(c-macro-expansion): Handle a and b comment styles.
(c-macro-shrink-window-flag): Renamed from c-macro-shrink-window-p.
(c-macro-prompt-flag): Renamed from c-macro-prompt-p.
(c-macro-prompt-p): Renamed from c-macro-always-prompt-p.
(c-macro-cppflags): Var renamed from c-macro-default-cppflags.
(c-macro-expand): Don't handle C-u C-u specially.
Compute message here in var mymsg.
Clear buffer-auto-save-file-name.
(c-macro-display-buffer): Now takes no argument.
Use point-max to get large number.
(c-macro-default-message, c-macro-eval): Functions deleted.
(c-macro-expansion): Use startinstring as the char to insert.
