Version 1.20.

* configure.ac: Raise version number to 1.20
* src/compare.c (diff_dumpdir): const.
* src/common.h (dumpdir_t,dumpdir_iter_t): New data types.
(dumpdir_create0,dumpdir_create,dumpdir_free,dumpdir_locate)
(dumpdir_first,dumpdir_next): New functions.
* src/incremen.c (dumpdir_create0,dumpdir_create,dumpdir_free)
(dumpdir_first,dumpdir_next): New functions.
(dumpdir_locate): Rewrite using binary search.
(struct directory): Change members char *contents, *icontents to
struct dumpdir *dump, *idump. All references updated.
(note_directory): Last arg is const.
* src/names.c (add_hierarchy_to_namelist): buffer is const.
* tests/incr03.at, tests/incr04.at, tests/rename02.at,
tests/rename03.at: Insert calls to sleep between creation of files
and adding them to the archive.

tests/incr03.at

@@ -34,6 +34,8 @@ mkdir directory
 genfile --file=directory/x
 genfile --file=directory/y
 
+sleep 1
+
 tar -cf archive.1 -g db directory
 
 mv directory/x directory/z

tests/incr04.at

@@ -38,6 +38,8 @@ awk 'BEGIN {
     printf("NAME_PREFIX[%03d]\n", i);
   }' < /dev/null | genfile --files-from -
 
+sleep 1
+
 echo "Initial dump"
 tar cvf a0.tar -g a.sna a
 mv a/b a/c

tests/rename02.at

@@ -34,6 +34,8 @@ genfile --file foo/bar/file.r
 mkdir foo/bar/baz
 genfile --file foo/bar/baz/file.z
 
+sleep 1
+
 echo "Creating base archive"
 tar -g incr -cf arch.1 -v foo
 

tests/rename03.at

@@ -39,6 +39,8 @@ genfile --file foo/b/fileb
 mkdir foo/c
 genfile --file foo/c/filec
 
+sleep 1
+
 echo "First dump"
 echo "First dump">&2
 tar -g incr -cf arch.1 -v foo 2>tmperr