New file-safe user variable: org-drill-scope. Allows customisation of the scope of drill sessions

(ie where items are sourced from). The variable can take the value 'directory', meaning items
will be sourced from all org files in the same directory as the current file. This is useful
for splitting up a monolithic item collection into smaller files, while still including all
those files in drill sessions.

The values of the SCOPE argument to org-drill have changed slightly. Possible values are the same
as those for 'org-drill-scope'.
- 'file' now means current file/buffer, respecting restrictions (default, same as old 'nil')
- 'file-no-restriction' means current file, ignoring (overriding) restrictions (same as old 'file')
- new value 'directory' (see above)
- other values have the same meaning as before.

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