Feature #3264: New method VMPool::calculate_showback
Feature #3264: Method to dump showback records
Feature #3264: Init calculate_showback stime from DB values
Merge remote-tracking branch 'origin/master' into feature-3264
Feature #3264: Add a method to calculate the showback data
Feature #3264: Add extra info to showback xml body
Feature #3264: New command oneacct showback to pretty-print showback data
Feature #3264: Add vm name to showback xml body
Feature #3264: Fix --csv option
Feature #3264: showback start and end time are now set as month,year
Feature #3264: Fix csv output for empty responses
feature #3264: Include showback in cloud view
Feature #3264: Move float_to_str to NebulaUtil
Feature #3264: calculate-showback uses month,year

And lots of bugs fixed
Feature #3264: Create new command oneshowback
Feature #3264: Command oneshowback calculate
Feature #3264: Move cpu/memory cost to obj template. Make them restricted
Feature #3264: Create new db table in onedb migrator
Feature #3264: HUGE performance improvement for oneshowback calculate
feature #3264: Extend showback support in Sunstone