(thumbs-new-image-size): New function.

(thumbs-new-image-size): New function.
(thumbs-increment-image-size-element)
(thumbs-decrement-image-size-element, thumbs-increment-image-size)
(thumbs-decrement-image-size): Delete.
(thumbs-resize-image-1): Rename from thumbs-resize-image.  Keep old
temp files and use to resize.
(thumbs-resize-image): Rename from thumbs-resize-image-interactive.
Use increment argument to enlarge/shrink.  Preserve point.
(thumbs-shrink-image): Rename from thumbs-resize-image-size-down.
(thumbs-enlarge-image): Rename from thumbs-resize-image-size-up
(thumbs-show-thumbs-list): Set thumbs-buffer to current-buffer.
(thumbs-mark, thumbs-unmark): Preserve point.
(thumbs-modify-image): Keep old temp files and use to modify.
Cleanup old temp files at load time.  Preserve point.
(thumbs-view-image-mode-map): Use new command names.