gui: make preferences dialogue modal for parents

Resolves rhbz#1120879

Signed-off-by: Jakub Filak <jfilak@redhat.com>
gui: select the first in the configuration list

Resolves rhbz#1120881

Signed-off-by: Jakub Filak <jfilak@redhat.com>
gui: wrap lines for human readable files

Wrap lines for comment and reason files.

Do not wrap lines for maps, backtrace, environ and ... becuase
these files are something like lists consiting from lines.

Resolves rhbz#1120871

Signed-off-by: Jakub Filak <jfilak@redhat.com>