atomic.h	atomic operations (not implemented: using mutexes now)
bitgrid.h	bitgrid struct
debug.h		debug functions: assert_hook, attach_debugger, trap
error.h		error codes and strings
forth.h		pf_vm_t and methods
hash.h		hashes (not used)
image.h		pf_image_t + macros and helper functions
link.h		forth dictionary link structure
list.h		scalar types + list manipulation
macros.h	convenience macros	TODO: clean up
matrix.h	pf_matrix_t
mem.h		memory allocation and atom reuse
packet.h	main composite (non-scalar) object/type system
plugin.h	plugin convenience routines	TODO: clean up
stack.h		(data) stack manipulation words + misc util words 
stream.h	stream interface
string.h	pf_string_t + string manipulation
symbol.h	pf_symbol_t	TODO: clean up
thread.h	pthread wrapper
typedefs.h	all typedefs
type.h		type symbol routines