Reorgaize user state computation for billing period
Use 'by need' parameter
Date calculator is mutable
Computing charge slots
[DNC]: Does not compile
Merge branch 'master'
Conflicts: src/main/scala/gr/grnet/aquarium/logic/accounting/Accounting.scala src/main/scala/gr/grnet/aquarium/logic/accounting/dsl/DSLCostPolicy.scala src/main/scala/gr/grnet/aquarium/logic/accounting/dsl/DSLCostPolicyVar.scala src/main/scala/gr/grnet/aquarium/logic/accounting/dsl/Timeslot.scala...
wip
Applicability timeslots for policies and timeslots
Charge events by spliting charge time intoslices defined by the applicability timeslots forpolicies and agreements
Store policies indexed per applicability timeslot
Trivial fixes, toString implementation
Method to align a list of timeslots to another timeslot's boundaries
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