Hack to solve tab problem: expand to eight spaces.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Add XOURNAL_GS_DISABLE environment knob to disable GhostScript processing.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Fix extra format parameter for boxfill.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>
Release 4.8~ezyang20140927

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>