New features for graphing temp, cpu and memory, and switch hardware platforms

[rbaboom-zz]

Added cpu, memfree and temp to the graphs available added hardware platform to allow for different OID's updated install doc and sample config file added new table to db for alt graphs

To do: still needs a little tweaking on the gui, add new graph types to the header for graphtype fix graph sizes and descriptions maybe change the area color from yellow to green need to do math on the kilobits so it graphs mem properly