+ Adds three new default org-capture templates, for todo, notes and
changelogs. It will use the first {todo,notes,changelog}.org file
found up the file heirarchy from the current file, or will use
{project-root}/X.org.
+ Variables in org-capture-templates are now resolved relative to
org-directory, if they aren't absolute.
+ Display target file in org capture window header-line.
Mentioned in #886.
I prefer not to invent new variables when they aren't strictly
necessary. org-directory is one such variable (although the other path
variables are still necessary).
lang/org's initialization process is now split up into hooks on
org-load-hook. This approach is cleaner and easier to customize. I also
removed the escape binding in org-agenda-mode-map, as the popup system
makes it redundant.
