Massive changes. Elf sections are now processed into BFD sections only

Massive changes. Elf sections are now processed into BFD sections only
if they make sense as independent sections; symbols and relocs are
turned into BFD symbols and relocs; objects are now created.
	objdump and copy mostly work on .o files.
	this check-in will be followed by gdb testing.
	the code has *not* yet been split up the way coff is to
support multiple architectures and bit widths.
	no ChangeLog entries yet; too big... nearly everything changed.