dewikt_audiosetter_de: don't retry where audio cannot be added
ported some code improvements from audiosetter.pl
dewikt_audiosetter_de: removed code related to local server
add audios only if no error, removed excessive logging at start, better progress report
dewikt_audiosetter_de: fixed progress reporting and edited pages limit
dewikt_audiosetter_de: better handling of error getting wikicode (copied from audiosetter)