fix bug #51673 with partial patch by Thomas Dean.
maint: update NEWS
maint: update makefile to run and clean bootstrap/configure
fix bug #50955 and update demo to look like in TISEAN webpage
maint: updating NEWS and INDEX
maint: merging contributions by GSOC 2017 student Piyush Jain
doc: fix texinfo deffunx
maint: update to new matGeom repository