minor, allow tag \t sym pairs on stdin to be passed to rotz-add

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'cmd/add' into next

* cmd/add:
  minor, allow tag \t sym pairs on stdin to be passed to rotz-add
Merge branch 'next'

* next:
  minor, allow tag \t sym pairs on stdin to be passed to rotz-add