[CHORE]: fj-doc-mod-fop, make accessibility and keep empty tags parameters configurable

[fugerit79]

Module

fj-doc-mod-fop - PDF, XSL-FO doc handler based on Apache FOP

Expected Behavior

fj-doc-mod-fop, make accessibility and keep empty tags parameters configurable

Other information

Currently :

		foUserAgent.setAccessibility( this.isAccessibility() );
		foUserAgent.setKeepEmptyTags( this.isKeepEmptyTags() );

Are not configurable, we want to make them configurable.

NOTE: setting accessibility to false usually produces smaller PDF size.