Support RT database deployment

[epage]

This includes

• Deploy (requires alias having been added to the host)
• Undeploy (requires alias having been added to the host)
• GetDatabaseList

[epage]

See #169 for GetDatabaseList being added without RT support and some of the trade offs considered.

[jashnani]

NI-XNET supports PharLAP, VxWorks, Linux RT (both ARM and Intel) on CompactRIO, WES7 on some CompactDAQ. Does that Python API need to support all those platforms?