Add of scheduling constraints on simulators

* Added checked constraint that verify that the time between two executions
  of the same simulator is equal to delta T
* Added forced constraint that force the time between two executions
  of the same simulator to be equal to delta T
* Updated openfluid command line display of delta t information
* Refactored fluidx format
* Updated tests

(references #184)
Management of scheduling constraints on simulators in Builder GUI

* Updated layout of run configuration form
* Updated run configuration management
* Renamed methods

(closes OpenFLUID/openfluid#184)
Removal of deprecated files buffer setting
Removal of deprecated simulation ID information
Refactoring of values buffer management

* Updated method for automatic buffers size, 
  now size cannot be less than 2
* Modified tag in fluidx file for fixed size
* Updated tests
* Updated newdata buddy
Fix of text mispells in Builder