* Use .bss and .sys from Syslinux v5.10
* Advanced options allow you to choose between v4 and v5
* Rufus does not currently copy any ldlinux.c32 to the target
* update copyright year
* switch relevant files to UTF-8 (without signature).
It's 2013 for crying out loud: if your file editor or file viewer
can't handle plain UTF-8, go back to the 1980s!
* also rename autogen.sh to bootstrap.sh