Added new routines for the numerical evaluation of iterated integrals like

Added new routines for the numerical evaluation of iterated integrals like
elliptic multiple polylogarithms or iterated integrals of modular forms.

Changes to be committed:
	modified:   check/CMakeLists.txt
	modified:   check/Makefile.am
	new file:   check/exam_inifcns_elliptic.cpp
	modified:   doc/tutorial/ginac.texi
	modified:   ginac/CMakeLists.txt
	modified:   ginac/Makefile.am
	modified:   ginac/ginac.h
	modified:   ginac/inifcns.h
	new file:   ginac/inifcns_elliptic.cpp
	new file:   ginac/integration_kernel.cpp
	new file:   ginac/integration_kernel.h
	new file:   ginac/utils_multi_iterator.h
	modified:   ginsh/ginsh_parser.ypp