few missing imports

Author: Affie

src/DistributedFactorGraphs.jl

@@ -529,6 +529,7 @@ include("Common.jl")
 
 function getSolvable end
 function getVariableType end
+function isInitialized end
 # In Memory Types
 include("GraphsDFG/GraphsDFG.jl")
 using .GraphsDFGs

src/GraphsDFG/GraphsDFG.jl

@@ -21,6 +21,7 @@ using ...DistributedFactorGraphs:
     getVariableType,
     getAgentLabel,
     getGraphLabel,
+    isInitialized,
     MetadataTypes
 
 # import DFG functions to extend

src/GraphsDFG/services/GraphsDFG.jl

@@ -503,7 +503,7 @@ function findShortestPathDijkstra(
         else
             varList
         end
-        deepcopyGraph(typeof(dfg), dfg, varList, fctList)
+        DFG.deepcopyGraph(typeof(dfg), dfg, varList, fctList)
     else
         # no filter can be used directly
         dfg