HEADINGSdoubleafter, \HEADINGSsingleafter, \CHAPPAGoff,
\CHAPPAGon, \CHAPPAGodd): Set \contentsalignmacro, analogous to
\pagealignmacro.
(\startcontents): Call \contentsalignmacro instead of \pagealignmacro.

From-SVN: r12587