Dynare++: move all documentation to the doc/ subdir

dynare++/doc/Makefile.am

-EXTRA_DIST = dynare++-ramsey.tex dynare++-tutorial.tex changelog-old.html changelog-sylv-old.html
+EXTRA_DIST = \
+	dynare++-ramsey.tex \
+	dynare++-tutorial.tex \
+	sylvester.tex \
+	tl.tex \
+	changelog-old.html \
+	changelog-sylv-old.html
 
 if HAVE_PDFLATEX
-pdf-local: dynare++-ramsey.pdf dynare++-tutorial.pdf
+pdf-local: dynare++-ramsey.pdf dynare++-tutorial.pdf sylvester.pdf tl.pdf
 endif
 
 %.pdf: %.tex

dynare++/sylv/Makefile.am

 SUBDIRS = cc testing
-
-EXTRA_DIST = sylvester.tex
-
-if HAVE_PDFLATEX
-pdf-local: sylvester.pdf
-
-sylvester.pdf: sylvester.tex
-	$(PDFLATEX) sylvester
-	$(PDFLATEX) sylvester
-endif
-
-CLEANFILES = *.pdf *.log *.aux
-

dynare++/tl/Makefile.am

 SUBDIRS = cc testing
-
-EXTRA_DIST = tl.tex
-
-if HAVE_PDFLATEX
-pdf-local: tl.pdf
-
-tl.pdf: tl.tex
-	$(PDFLATEX) tl
-	$(PDFLATEX) tl
-endif
-
-CLEANFILES = *.pdf *.log *.aux