[Paraview] Manage plugins

[Jean Favre]

I have been successful at migrating my custom readers to 3.0.1, using 
the plugin interface, and loading my stuff via the "Manage plugins..." 
dialog.

The procedure is manual and has to be redone each time I start ParaView. 
What I am missing is something similar to PV_INTERFACE_PATH, to tell 
paraview3 to automatically load custom plugins. Did I miss some obvious 
info?

Is there a run-time option, or some flag to set to enable automatic 
loading of plugins?

TIA
Jean
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