Improvements in the handling of crontab comments

Improvements in the handling of crontab comments include appending all commented lines above a cron expression and discarding previous ones if there is an enter.

Works situations

#- - - * randomtext abc
#5 * * * *       /home/ubuntu/teste.sh


#- - - * randomtext abc
5 * * * *       /home/ubuntu/teste.sh
#- - - * randomtext abc
#5 * * * *       /home/ubuntu/teste.sh

#- - - * randomtext abc
#5 * * * *       /home/ubuntu/teste.sh

#- - - * randomtext abc
5 * * * *       /home/ubuntu/teste.sh

# another comment
#- - - * randomtext abc
5 * * * *       /home/ubuntu/teste.sh

Before:

header	header

After

header	header

Another example

#- - - * randomtext abc
#5 * * * *       /home/ubuntu/teste.sh
#- - - * randomtext abc
5 * * * *       /home/ubuntu/teste.sh

#teste abc
#\  * * *       /home/ubuntu/kde/src/kcron/Messages.sh
#testes comentários
10 * * * *       /home/ubuntu/kde/src/kcron/Messages.sh

BUG: 432679