Restamper

Added nodes to update the timestamps of /detect_equipment, /saphari/human and publish them to <topic_name>/restamped .
Added a node that subscribes to /tf_real and publishes the transformations with updated timestamps to /tf.
The names of the topics that the nodes subscribe and publish to can be changed in the launch-files.
Added a python script that renames a topic in a bag-file: 
<code>python rename_topic.py old.bag "/old_topic" new.bag "/new_topic"</code>