whonix_shared/etc/sdwdate.d/30_sdwdate_default: removed $(mktemp --directory), always a bad idea to have forking code in config files. sdwdate will still default to mktemp --directory.
removed apper and synaptic from default installation, because they are too confusing / have too many bugs, do not always work in all cases for all users, #104, can still be manually installed if wanted, see also https://www.whonix.org/wiki/Dev/Automatic_Updates