Make Bareos packaging more Debian compliant

Install READMEs as docs into bareos-doc,
Set Standards-Version: 3.9.5,
Do not ship .la files, as suggested in Policy 10.2,
Remove dependency to hostname package, as it is always installed,
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
Add debian/watch file,
Depend on bsd-mailx | mailx instead of only mailx,
Some changes to the descriptions (wording, fixing too long Description lines),
Drop autoconf/config.log and add it to gitignore,
Install bat help in a subfolder of htmldir

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>
Update AUTHORS