A minor reorganization

[Alexander E. Patrakov]

I wrote:
> Bruce Dubbs wrote:
>> In conjunction with some of Alexander's proposals I would like to 
>> makes some changes.
>>
>> Does anyone object if I move section 4.5 (About SBUs) to right after 
>> section iv (Host System Requirements).
>>
>> I also want to rename the SBU section to "Time to Build an LFS 
>> System".  And add some discussion about the overall time to build.
> 
> Let's wait a bit for alternative proposals on renaming.

No proposals :(

So let's go either with your variant, or with "Hardware and Time Requirements" 
(and possibly rename "Host System Requirements" to "Host System Software 
Requirements"). My variant of renaming also allows to mention the "x86-only" 
limitation of LFS in any of the two sections.

-- 
Alexander E. Patrakov