[FIX] Roe average computation
[ENH] allow for BC fields to be different from interior field
[COSM] fix few semantics warnings
Allow finding plugins 2 levels deep, such as in repo with multiple plugins
Merge branch 'master' of github.com:coolfluid/coolfluid3

* 'master' of github.com:coolfluid/coolfluid3:
  [ENH] renamed parse_and_deduce_variables
  [ENH] AnalyticalFunction improved error reporting, [ADD] parseAndDeduceVariables for auto-detecting variable names
  [ENH] add component type info to print_tree() #246