Add SqlAction.getEventLogPercent method

This method provides the raw percentage used by
Kenny's reindex script but at the API level.
Add ome.services.metrics package

As a very thin wrapper over com.codahale.metrics,
this package provides a number of ways to track
server-side happenings.
Provider getter for PersistentEventLogLoader key
Integrate metrics into Indexer

With this commit, once an hour (and constantly via JMX),
the indexer provides metrics on how long each batch is
taking and how close to "completion" (i.e. being up-to-date)
it is in a unix-style 1min,5min,15min split.
Handle null metrics in Indexer
Add metrics support to PixelData
Include percent calculation in timer
ibiblio only contains metrics 3.0.1
Improve customization of training_setup.sh script
Use field from pojos.
Remove tabs and white space.
Recycle pixels store.
Pass close parameter to iterate method.
Move import
Fix issue when turning line into polyline.
Display segment length and angle.
Remove System.err.println
Use Line color for measurement.
Update header.
Remove System.err