New build system in "master" branch

[Alan DeKok]

  After 10+ years of fighting recursive make, I've committed a new
system.  It's only used if you want, by editing Make.inc, and adding a line:

	BOILER=yes

  When you do that, the build should be MUCH faster.  Everything goes
into a "build" directory, so don't look for libs/binaries in their usual
places.

  On my system, the build is rather a lot faster.  Anyone doing even
occasional development should look into using it.

  Let me know what you think.

  Alan DeKok.