Minor whitespace fix in help output
Fix for adverts sent when AdvSendAdvert = off

Adverts were being sent in send_ra with AdvSendAdvert = off because
there was no check to make sure AdvSendAdvert = on.  This commits
adds a check.
Update CHANGES and VERSION (to 1.9.6)
adding TODO comments regarding AdvSendAdvert
do NOT do this: ioctl(sock, SIOCGIFMTU | SIOCGIFHWADDR, &ifr)

Attempting to get more than one value in an ioctl at one time is
bad.  At best, one value will be gotten.  The return values in ifr
are a union, so getting the MTU and hardware address at the same
time will overwrite and corrupt the values.
improved logging for hardware type
updating CHANGES and VERSION for 1.9.7
removing unused INCLUDES from Makefile.am