goto-vim: add debug messages
goto-vim: add a lookbehind to avoid partial matches

Would misdetect "gtk/gtkplacessidebar.c" as "/gtkplacessidebar.c"
accdb: explain dump flags
accdb: reveal output when merging
accdb: make do_merge output a database

Now I can `:%!ad merge` in vim.
accdb: try to clarify dumpflags
gnome-screenshot-import: adapt API to g-s git
wget-raw-archive.org: use `lynx -source`, oddly more reliable