Split plain/interface/devclass attribute initializers.
Implicitly define empty "attribute" for "device attachment".  Much less
troublesome than "device" and "interface attribute".
Implicitly define attribute for filesystem.
Work-in-progress support for the AllWinner A31 SoC.
Add Merrii Hummingbird A31 board specific info + kernel config.
Implicitly define attribute for options.
Add cimag (apparently accidently dropped in previous revision and reorg)
Fix link echo indent.
Implicitly define attribute for device.
Define "kern" attribute (a.k.a module).  Mark kern_*.c (and some others) as
"kern".  Always select "kern" in sys/conf/std.
Add missing catanh variant (and readd it to the Makefile list)
Define "uvm" attribute and mark files.
Add a bunch of new libm/complex man pages
copy&pasto
Use opt_*.h to not polute CPPFLAGS.

Attribute dependency is not yet.  Revert a definition.