-WARNS6 cleanup (1556 warnings)

-WARNS6 cleanup (1556 warnings)
-ANSI function declarations
-staticize functions
-remove previously commented out code
-remove unneeded -ltermcap and -lcompat
-rename local variable names that shadow globals
-remove void casts for unchecked function returns
-move global variable declarations in externs.h to globals.c
-redefine the blockalarm() and unblockalarm() macros using POSIX and
	tty semantics (taken from NetBSD)
-fix a typo in main() that wasn't incrementing the randomize variable
-use variable argument lists froms stdarg where applicable
-add a new function fmtship() which puts ship info in a string that can
	later be printed (taken from NetBSD)
-add DragonFly keyword