[ENH] Allow boundary fields to be created in derived PDE classes
[FIX] removed assertion that can fail in cf3mesh/Reader
[FIX] update_structures after extracting
[ENH] In python, get_child() will return None if not available
[ENH] Access to evaluated max_cfl in TimeStepComputer
[COSM] fix wrong comment
[FIX] build_used_nodes_list now works when some entities are not defined in dict
[ENH] make an option basic
[ENH] new ComputeCFL action computes cfl local to cell
[ENH] coolfluid.Core.barrier() function exported to python API
[ENH] TurbulenceStatistics field can restart from previous count
Merge branch 'master' of github.com:coolfluid/coolfluid3

* 'master' of github.com:coolfluid/coolfluid3:
  [FIX] Broken tests, revert regist_signal_handlers default
  [FIX] UI test
  [FIX] Broken tests
  [ENH] UFEM: Remove reference velocity
  [FIX] Compile errors
  [ENH] Trilinos DirectStrategy can be reset periodically
  [FIX] UFEM: Wrong default for c2
  [ENH] UFEM: Add config options for SUPG
  [ENH] Add PrintTimingTree action
  [ENH] UFEM: Incorporate improved PSPG
  [DEV] UFEM: Try minimal edge length for stabilization
  [DEV] UFEM: More SUPG coefficient adjustment
  [DEV] UFEM: test alternative bulk viscosity
  [ENH] UFEM: allow user adjustment of SUPG stabilization
  [ENH] UFEM: Add optional skipping of velocity assembly
  [ENH] UFEM: Use symmetric velocity matrix
  [FIX] UFEM broken tests, LSSAction strategy
  [FIX] UFEM: Propagate LSS strategy change
Merge pull request #260 from wdeconinck/master

Few improvements
[MERGE] Merge UFEM particle coagulation work