feature/noverlay updated (8bd114b98a -> 780d3d8df2)

[Stefan Monnier]

monnier pushed a change to branch feature/noverlay.

      from  8bd114b98a itree.c: Get rid of the trick using null->parent
       new  6dff825a99 ; * src/itree.h: include "lisp.h" for Lisp_Object
       new  0fcd6de93b ; * src/itree.h (struct interval_node): document field 
invariants.
       new  cab3b67652 ; * src/itree.c: change comments for clarity.
       new  c0d5026321 Use a bool instead of a bitfield
       new  780d3d8df2 ; * src/itree.c: Add comment describing when noverlay is 
O(N)


Summary of changes:
 src/itree.c | 56 +++++++++++++++++++++++++++++++++++++++++++++-----------
 src/itree.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 92 insertions(+), 13 deletions(-)