Note this implies a semantic change, as previously the interval
was divided into 2^subsampling intervals. Now the explicit number
of intervals is set.

Also adjust some names in files and broken links.

While these might have there somewhen they do not exist in current master.

Fixes errors
"  DEFAULT_PDF option removed in version 2.0.  Use FORCE_PDF option or
  LATEX_DEFAULT_BUILD CMake variable instead."
and
"  MANGLE_TARGET_NAMES option removed in version 2.0.  All LaTeX targets use
  mangled names now.
"

in Ubuntu 16.04 LTS.