[CentOS-docs] HowTos/MigrationGuide

[Phil Schaffner]

Please (particularly Smooge) review and comment on the new content at

http://wiki.centos.org/HowTos/MigrationGuide

Based heavily on the pieces I added earlier to

http://wiki.centos.org/Migration/5

Tried to keep it general.

Would assume that we want only one page on Migration with sub-pages for
specific versions.  I referred to the CentOS 3 FAQ entry on WBEL
migration but it would seem to be cleaner to change the structure to
something like

http://wiki.centos.org/HowTos/MigrationGuide/CentOS2
...
http://wiki.centos.org/HowTos/MigrationGuide/CentOS5

FAQ entries could point to the corresponding sub-pages.  Opinions?

Phil