simple tsort without support for cycles

Signed-off-by: Mattias Andrée <maandree@operamail.com>
support cyclic graphs

Signed-off-by: Mattias Andrée <maandree@operamail.com>
tsort doc on cyclic dependencies

Signed-off-by: Mattias Andrée <maandree@operamail.com>
identify missing dependencies and do not crash because of it

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m

Signed-off-by: Mattias Andrée <maandree@operamail.com>
doc tsort

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m

Signed-off-by: Mattias Andrée <maandree@operamail.com>
remove test mane

Signed-off-by: Mattias Andrée <maandree@operamail.com>