Transition doc/ to manual pages
These are older documents that need a bit of love. Some should become manual pages in section 7, others should maybe just be deleted, or maybe go onto the website instead. doc/welcome probably belongs somewhere else. Maybe they should actually just be moved into share/doc. I mean documents such as cross-compilation-sins , obsolete-stuff, portability-sins, porting-guide, and posix-divergence. I'd like for this to be done by the 1.1 release, hopefully, as this doc/ concept should be obsoleted.