When writing a GPT partition table, merge all actions into a single commit.

This avoids unnecessary udev events, which in some cases were causing
udevd to trigger a kernel partition table reread, causing the kernel
to get out of sync with drakx.

In order to do so, the libparted bindings are enhanced so that we
manipulate a 'ped_disk' object:
- disk_open() returns such an object
- set_disk_type() is removed
- disk_commit() writes back the partition table and tell the kernel
  about it
  if we fails to write the partition table, we let
  partition_table::write() fire an exceptionc
  if we only have succeed in writing the partition table, we let
  partition_table::write() try harder (umounting partitions before
  trying againt to tell the kernel again)
- need_to_tell_kernel() is overrided

The last change is needed because we now tell the kernel about the new
partition layout in partition_table::gpt::write() when calling
disk_commit() while previously we were deferring that to
partition_table::write() which after having called the gpt's write()
calls tell_kernel() -> c::tell_kernel_to_reread_partition_table()

So we must tell partition_table::write() that telling the kernel to
reread the partition_table is not needed if we already succeeded in
that.

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