Sharing cached downloaded data

[furushchev]

Some packages downloads rosbag or pretrained data on build time and they are cached at ~/.ros/data.
Currently after building jsk_recognition packages, ~/.ros/data uses disk space about 16GB.
For those who use mobile robots, it will be required to install each workspace on user spaces, which means that at least 16GB free space is required for each users.

[wkentaro]

wkentaro at hoop in ~/.ros/data tm 12:33 
% du -h -d 1
11G	./jsk_pcl_ros
3.5G	./jsk_apc2016_common
868M	./jsk_pcl_ros_utils
2.8G	./jsk_perception
1.5G	./jsk_arc2017_common
13G	./hrp2_apc
32G	.
wkentaro at hoop in ~/.ros/data tm 12:33 
% cd jsk_pcl_ros
wkentaro at hoop in ~/.ros/data/jsk_pcl_ros tm 12:33 
% du -h -d 1 -a 
512M	./2016-10-29-17-05-44_tabletop-coffee-cup.tgz
255M	./2015-11-04-19-37-29_baxter-kiva-object-in-hand-cloud.tgz
511M	./2015-11-04-19-37-29_baxter-kiva-object-in-hand-cloud
361M	./2016-07-06-12-16-43-person-in-point-cloud.tgz
832K	./2016-10-26-02-09-51_coffee_cup.pcd
150M	./sample_add_color_from_image_20170319.bag
68K	./drill.pcd
721M	./2016-07-06-12-16-43-person-in-point-cloud
7.1G	./2016-10-29-17-05-44_tabletop-coffee-cup
9.4M	./2016-06-24-17-43-57_tabletop.bag.tgz
1006M	./2016-06-24-17-43-57_tabletop.bag
206M	./stereo_arc2017_objects.bag
11G	.

@knorth55 Please put smaller rosbag data replacing /2016-10-29-17-05-44_tabletop-coffee-cup.