Improve soak graphs and content

+ Fix duration, mention number of tests and runs.
- Hover information still feels wrong.
+ Mention "critical rate" instead of "throughput" where possible.
+ Mention lower bounds are displayed.
+ Rename "plrsearch_algorithm" label to "PLRsearch".
  + Because the previous link did not work. Due to underscore?
+ Rename "SOAK" to "soak" or "Soak" (except when it is a tag).

Change-Id: I9c079f8c2e93d96249d4b60893469c9257d4f3db
Signed-off-by: Vratko Polak <vrpolak@cisco.com>