Include directive: more than one sections/profile should be included in a profile

it should be possible to include more than one section/profile in a given profile.

example:

[BackgroundService]
scheduler_host=8of9.sos
scheduler_port=4242

[MailSettings]
file_notification_to=kb@sos-berlin.com
file_notification_subject=SOSFTP-Client mail
file_notification_body=This is a test.
mail_smtp=smtp.sos

[wilma_user]
user=test
password=**
ssh_auth_method=password

[wilma_host]
host=wilma.sos

[do_ftp]
protocol=ftp
port=21

[do_sftp]
protocol=sftp
port=22

[ftp_receive_1_wilma]
include=wilma_host,wilma_user,do_ftp,BackgroundService,MailSettings