fix bug of display of nodes in the graph
"save as" all the time enabled
miniature of picture in reader nodes + can select with mouse in paramString
Merge branch 'develop' of https://github.com/buttleofx/ButtleOFX into dev_menu
Fix Modal pop up window #57
can remove a reader node in quickmode
Merge branch 'develop' of https://github.com/buttleofx/ButtleOFX into dev_menu
minor fix on image path of nodes + paramString don't use createQmlObject but Loader
Fix bug on path parameters #59
Fix an error on textEdit of paramString + minor ergo changement

buttleofx/gui/paramEditor/qml/ParamString.qml:87:25: QML TextEdit:
Binding loop detected for property "text"
changes on paramString for open/save

-add a component in loader for OfxParamStringIsLabel
-add a fonction in stringWrapper and paramString python file
-change the way to distinguish open and save window with this function