nsf.c: - added nsf::var::get and "::nx::var get" to provide selector based interface for variable reading (used in slotmethod get of nx::VariableSlot) - cleanup of nx.tcl and TODO
- add flag "-onerror" to nsf::forward::method to handle errors during dispatch of a forwarder (not all error messags of forwarder are already transformed) - added log-level Info which prints always, e.g. for "-verbose" flag of forwarder - drop setter-rule from properties (use always forwarder) - drop "/obj/ /prop/" and "/obj/ /prop/ /value/" in favor of "/obj/ /prop/ get" and "/obj/ /prop/ assign /value/" to achieve better orthogonality with e.g. incremental properties