[mnemo] Some problems with notes ...

[Marc G. Fournier]

Based off of a CVS update performed this morning:

1. "Modify Note" behaves unexpectedly - although modifying a *modified*
   note just overwrites the previous one, modifying an original note does
   not (i.e. we end up with two: the original and the modification).

2. Options/Notepads/Create doesn't seem to actually create any notepads,
   although the process seems to be successful

3. Options/Category Management: If you set a category's color, and then
   select "rename" to rename it, it cancels out that color setting (and
   any others set since the last save).