Change the behavior node configuration and dynamic resource allocation

[aholmes]

Dynamic resource allocation may be important for groups external to BPL. Currently, when determining which node configuration file to include (lowmem, midmem, execute), known node configurations are used to figure out which file to include. If the node does not match any of these configurations, then an error is thrown.

Instead of erroring, instead display a warning and do dynamic resource allocation.

#36 (comment)