add system report check for permalink setting

fixes #56
tighten logging printer
improve feed deletion dialogue
default title for episode assets is file format title
release 1.6.0-alpha
fix call-time pass-by-reference

issue #86
temporarily deactivate logging mails

issue #86
release v1.6.1
fix template migration
release 1.6.2
version bump
remove player from feed

fixes #87
:bug: fix accidental error log that all assets are missing
reenable logging mails
fix timezone in logs
fix merge_episodes setting

fixes #88
chapters at 0 seconds are not ignored any more

fixes #91
correctly show feed title in deletion confirmation

fixes #92
handle missing/invalid PSC file with appropriate grace

fixes #90
release 1.6.3