Add DBR recovery and manage DBR slaves dynamically

[mdviz]

Enable a render to continue if/when a single DBR slave crashes or dies. The host should be able to 'kick' the slave off after an error is reported.

Currently the render Message display reports when a slave goes down or dies and then the host render machine crashes completely usually requiring a hardware reset to recover which can lead to loss of data/work.

Small studios, home based and freelancers rely heavily on Mental Ray and DBR as they cannot afford the luxury of expensive alternatives.

This is part of the 3DS MAX package and as such AD should be coding the integration/operation so that it works as reasonably and reliably as expected.

This is  also considered a bug that has been around since DBR was introduced, reported many times but still not fixed. See this thread http://forums.autodesk.com/t5/3ds-max-shading-lighting-and/dbr-kills-max-even-if-a-single-slave-dies...

PLEASE please FIX!

In addition, idea:

Create a DBR management app to add/remove slaves automatically/manually. Users often have dual usage slave workstations that only become available when other users are are finished using them. This would require extending the currently embedded DBR window 'management' into a floating applet type interface (like the render manager app) for managing DBR.