dir startscript also checks the configuration

Also added a debug message to the dummy libbareoscats library
meta-package → metapackage
fix too long Description lines
python → Python in descriptions
depend on bsd-mailx | mailx instead of only mailx

fixes the following lintian warning:
W: bareos-director:
 virtual-package-depends-without-real-package-depends depends: mailx
documentation is arch:all
bareos-doc should go into the doc section
add debian/watch file
Sqlite → SQLite in descriptions
let bareos-dbg properly depend on all the packages it proves symbols for

depending on the arch:all bareos package is wrong in several ways:
 - using binary:Version for an arch:all package will cause problems
   with binNMUs (https://wiki.debian.org/binNMU)
 - it will force everyone to install ALL packages when debugging a
   (e.g.) filedaemon only problem
hostname is essential:yes, no need to Build-Depend on it
do not ship .la files, as suggested in Policy 10.2
Standards-Version: 3.9.5
install READMEs as docs into bareos-doc