2015-06-15
	* v0.5
	* Fix: OCG ID lists with leading/trailings spaces passed as
	argument to the OCG visibilty setting commands caused an error; the same
	with empty arguments.
	Improved behaviour of visibilty setting links that are themselves
	part of OCGs.

2015-03-16
	* v0.4
	* Fix: no more PS specials from `ocg-p.sty' in dvipdfmx mode

2015-03-11
	* v0.3
	* New: ocg environment option `viewocg=always|never|ifvisible' added;
	macro \fxocg@insert@OC allows package authors to insert
	/OC <<OCMD with currently open OCGs>> entries into (suitable) pdf objects,
	i. e. XObjects & Annotations, to make them PDF-layer aware.
	* Fix: dead tikz-generated ocg buttons (from tikzlibraryocgx.code.tex) with
	dvipdfmx/xelatex

2015-01-26
	* v0.2
	* Fix: It was not possible to reference an OCG before defining it.

2015-01-23
	* v0.1
	* New: initial release