docbook45.conf:
- Fix page-wide sidebars, since a recent upgrade to AsciiDoc and/or DocBook broke them.
(It used to be possible to pass AsciiDoc blockdef “options” through to any block, but now it’s not,
so I needed to defined a whole new block type.)

fo.xsl
fo-table.xsl:
- While fixing pagewide sidebars, I decided to fix the spacing around and within “tables in sidebars”.