DiskProbe: use layouted view for StringEditor.

Fixes #11476.
Session: reinit ioctl data before sending it again.

The structure is used as input and output from ioctl, so we must clean
it before doing the ioctl for the second try.

May fix #11477.
Wrap config_headers readme to 80 columns.
Remove some unneeded file and partitionning systems

* googlefs: not working, needs update to match current page layout of
google searches
* Amiga and Apple partitionning systems: made them 68k and ppc-only,
respectively. There is not much use for those on x86 systems.

Also remove kdlhangman from the bootstrap packages.