vf_setpts: switch to an AVOptions-based system.
vf_settb: switch to an AVOptions-based system.
Merge commit '33b97faaba2744f0a2fd65c0ef9ecc2de3fad7ff'

* commit '33b97faaba2744f0a2fd65c0ef9ecc2de3fad7ff':
  vf_setpts: switch to an AVOptions-based system.

Conflicts:
	doc/filters.texi
	libavfilter/f_setpts.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/smartblur: switch to AVOption-based system
lavfi/smarblur: add missing newline at end of verbose message
Merge commit 'ffea3b00c39caa8ad78456ae08c8353929974dfd'

* commit 'ffea3b00c39caa8ad78456ae08c8353929974dfd':
  vf_settb: switch to an AVOptions-based system.

Conflicts:
	doc/filters.texi
	libavfilter/f_settb.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
lavfi/field: switch to AVOption-based system

Also remove mention to syntax explanation which is or will be redundant
and possibly confusing.