Added: a layout can carry its own pictures. Layout → Pictures… ticks them from your
pool; they are copied into a folder belonging to that layout, and while it is chosen
they are what the clock draws — the arrangement and the pictures as one set, like a
simple skin. Import and Export carry them as an ordinary folder per layout, so the
zip can be opened, rearranged by hand and put back.

Added: New layout, and a way to put the starter layouts back, on each list. Before
this a layout could only be made by copying one, so deleting them all left no way
back. Putting the starters back only ever adds — one whose name is already there is
refused rather than written over.

Changed: a layout is named like a variable in C — a letter, then letters, digits and
underscores. The name is a folder on the phone and an entry in an exported zip, and
names differing only by a space or a bracket collide there. Names beginning with _
belong to the app. Layouts you already have are renamed to fit when they are next
read, and their pictures move with them.

Fixed: every sideways layout was exported under the same name, and writing the
package could stop the app responding. Fixed: a package holding layouts and no
settings could not be brought in at all.
