Improved support for Plan 9, older SunOS, and AIX.
Not my finest moment
Moved to networking.h

Plan 9 requires u.h in every file
Moved Unix support 

Networking.h is imported by everything.
That newline looks cleaner
made install.md Unix friendly
Fixed reverting install.md
FBSD 10+, SunOS support
missing #endif
Merge pull request #702 from stqism/patch-4

Improved support for Plan 9, older SunOS, and AIX.