This commit adds the following new type attribute
<type ... dosparttable_extended_layout="true|false"/>
If set it specifies to make use of logical partitions inside
of an extended one. Effective only on type configurations which
uses the msdos table type, it will cause the fourth partition
to be an extended partition and all following partitions will be
placed as logical partitions inside of that extended partition.
This setting is useful if more than 4 partitions needs to be
created in an msdos table.
In addition to the support for extended/logical partitions the
the attributes 'mountpoint' and 'filesystem' in the <partitions>
section becomes optional. This also allows to place partitions
as placeholders not mounted into the system
2da706f5ed