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* If -y is not specified and a cache file is found, ask the user before
using it.
* "Fix" the -c option's behaviour. With this commit, if -c is applied,
the system will use the provided cache file if present and will do a
debootstrap if the file does not exist. The result of debootstrap will
be saved in the default cache file provided by the HELPER_CACHE_FILE
variable. This way, we do not need to provide an extra "disable cache
file option". One can run the program with -c "" to get this behaviour.

Update the windows registry in Unattend.xml to force an automatic
Windows Update

This bug was introduced in commit 88262dba that added pipefail bash
option to all configuration tasks

This is needed because common.sh contains functions that use pipes,
and the script should fail if any command fails.

The system's architecture is needed by debootstrap.

When get_distro and get_base_distro do not detect the linux distribution
a warning is triggered.

AssignHostname fails if the distribution is not known.

The bug had to do with the presence of a space character right after =
in a variable assignment.

This way we can restrict the size of the files created by the helper.

The device argument in tunefs command was erroneously ommited.

Check if the filesystem is clean, and fail if not.

Remove a redundant echo.

Not all tasks, should be able to be excluded. If MountImage,
UnmountImage and InstallUnattanded are never excluded, then the system
deployment can't break. If you don't want to mount the image or install
Unattend.xml then you probably want to use EXCLUDE_ALL_TASKS, since all
other tasks depend on the aforementioned ones.

 * Add -y option to e2fsck, otherwise the program complaines for not
   running in an interactive shell
 * Fix a typo in a variable

Also did a minor cleanup in AssignHostname task

New format: EXCLUDE_TASK_<task_name>

Add Giorgos Verigakis in the AUTHORS list for contributing pithcat.

 * Drop "custom" image format type. The same functionality is provided
   by network-hosted images.
 * Images with id that starts with "http:", "https:", "ftp:", "ftps:"
   are considered to be network hosted and are downloaded via cURL.
 * Images with id that starts with "pithos:" are considered to be
   pithos-hosted.
 * Support for pithos and network hosted images is disabled by default.
   You may enable it when configuring the project  using
   --enable-pithos-backend and --enable-network-backend respectively.