tests/test-debugindexdot.out

tests: Windows compatibility fixes

- printenv.py, md5sum.py, simplemerge, test-archive, test-merge1,
  test-merge-symlinks: set standard streams to binary mode
- test-encode: replace "gunzip" by "gzip -d"
- test-hup: requires fifo

created new head
digraph G {
	-1 -> 0
	0 -> 1
	0 -> 2
	2 -> 3
	1 -> 3
}