Skip from mounting swap on installation time if found on mount_devices
Cnchi was trying to mount swap when installing.
This was failing and Cnchi was creating a folder called /installswap as
it tries to create the destination mount point if doesn't exist
Changed warning message about advanced setups from welcome screen to
language screen.

Removed old warranty advice with possible data loss warning
add RAID5/6 support for btrfs
Revert "add RAID5/6 support for btrfs"

This reverts commit de032ebe6a7b168df6b193c2e39a4f6ff5fe6a09.
[cli_installer] add RAID5/6 support for btrfs
Merge branch 'master' into alongside

Conflicts:
	src/installation_process.py