Merge branch 'develop'
make apt repository initial and enable GSE to update it
add essential system packages and correct file name für DLv3
ISO file size optimizations #129
refactoring
explicitly add Python
create backup directory
backup > backups
basename GS_DIR
remove unixODBC 2.3 and use default from Wheezy
add sysadmin tools
add kernel core dump tools
add mailutils and sshguard
add packages for Single Sign On
move apache2 configuration to GSE
add other essential packages for SSO
move odbcinst.ini to GSE
add missing kernel headers for open-vm-tools
make kdump optional
add pcapsipdump