README: Rearranged the text, making the simple base usage first.

dwarfdump/dwarfdump.c, dwarfdump2/dwarfdump.cc:
Commentary changes relating
to dwarfdump.conf.  No code change.
tsearch/ESSAY.txt
Now that I finished my own version I felt
free to look at other tree search codes.
Added comments about other tree search free code
tsearch/ESSAY.txt : small tweak of comments on libavl build,
which works fine as long as one just builds the C objects and
programs.
tsearch/ESSAY.txt : Minor fixes of avl comments.
tsearch/ESSAY.txt : Additional detail added to the Further Reading
section.
The following files have been deleted here,
no longer useful here.  See dwarfstd.org
for these and other files about the standard(s).
dwarf.v2.mm
dwarf.v2.pdf
index.v2.mm
index.v2.pdf

Removed mention of the above files from :
COPYING
Makefile.in
README
Noted in libdwarf/NEWS that
the dwarf.v2.mm and index.v2.mm are no longer
in the distribution, they are on dwarfstd.org