Fix executable permissions on a few files
remove executable bit from library file

make Lintian happy by fixing it the other way around, see
https://github.com/superm1/mythtv/commit/ff09a712296bebe5922f7bd400a35b67cacb95c9
Have backendhousekeeper check for artwork update boolean.
Perform run checks for housekeeper tasks set to run on startup.

This may need some rethinking if we want a way to bypass the checks and
force something to run on startup.
Fix mask image scaling after dfd97aa0