Steve Tell

Add brief documentation of the command-line options accepted by gwave

add menu item to show/raise all of the variable-list windows;

fix VisibleWave-set-tooltip, and call it from new-visiblewave-hook to set

checkpoint work in progress on restoring tooltips

various fixes.

further experimentation with GtkBuilder for dialogs

WIP on gtkbuilder-based way of doing complex dialogs

message typo fixes and Makefile.am improvements contributed by Ahmed El-Mahmoudy