#37 Import/Export of text does not round-trip

[Ned Konz]

Several things don't survive a text export followed by
an import (as of the CVS version that I just built):

Percent done [0%] -- imported as text

Dates (01/30) -- imported as text

Priority <5>

Done [*]

Notes -- no way to distinguish them from tasks; they
get converted to tasks on import

I suggest that the import should be able to
successfully read an exported outline without data
loss. A simple regex should be able to snag the percent
done and dates.

As for the notes, there are two ways I can see to
handle this:

(1) mark the text lines of notes with a leading string.
I use '| ' (vbar, space) in an outliner I wrote, but
that's just a suggestion.

(2) mark the task lines and not the note lines to
indicate that they're tasks. Perhaps leading hyphens or
asterisks?