Fixed bug in DebugVariablePanel, cursor not reset when graphs were reset

Added support for adding a variable in program VariablePanel by drap'n dropping located variable like in global VariablePanel

Fixed bug in PouInstanceVariablesPanel buttons tooltips

Fixed bug when quitting project with more than one LD Viewer opened

Fixed bug list of ConfNodes blocks not refreshed when a library was enable or disable

Fixed bug in LogViewer when no Log Messages are available when first SetLogCounters

Fixed wrong default value for xsd:positiveInteger and xsd:negativeInteger in xmlclass

Fixed bug in LogViewer in Log Messages to retrieve index calculation when first SetLogCounters

Fixed bug in displayed datetime, using local timezone instead of UTC

Now Debug Buffer Unpacking is a separate function, declared in typemapping.py

Optimzed tracing of STRING type variables value. Now, only used size is transfered in debug buffer.

chmod +x PLCOpenEditor.py

Fixed retrieve and publish call order in PLC generated code

Fixed bug in LogViewer when view is filtered and displaying last message and new messages appears

Added exception printing on Pyro connector, tracking random connection failure...