2.8.6 released

- Fix a bug in _BIOSDISK_gettype() about disk detection by BIOS 0x13/0x15 service
- When creating /boot/gujin.cmd, the kernel file name is terminated by * after the first dot and minus
- The BIOS status of last disk/disquette operation was not updated correctly when access was successfull
- It is now possible to auto-boot the last kernel after forbidding Gujin to write the disks
- If auto-boot timeout is set and no kernel was stored (Gujin write to disk disabled), latest kernel is booted
- On Debian, the installer is compiled with the "dpkg-buildflags" parameters