dev
client: more robust handling of missing app.config
client: only warn about first scan if prereqs are present
client: give up early if auth failed on download_dedrm
client: always print errors with CliPrinter
fixup! 1f97b036c51f0cb6bab53eb1b9bdf128002a8b23
client: better searching for ebook-meta
fixup! 906a390a
client: better messaging on error in debug mode
client: handle no Kindle or Adobe DE