when manager unselects 'add_ask', the system didn't revert to the files
without added ask. This fixes that. To test, toggle the add_ask
checkbox and save campaign.
the download bits are suppressed when the ask comes from the pdf
seems we weren't making new ebooks when new files were uploaded
old ebooks now deactivated so we don't loase download counts and history
add ask to pdf is triggered by file upload or THANKS campaign save
note that to test file upload loacal, you need to set up file storage
in local settings. for example,
MEDIA_ROOT = '/Documents/media/'
DEFAULT_FILE_STORAGE = 'django.core.files.storage.FileSystemStorage'
eric