Move plugin examples into plugins/Examples instead of plugins/python/Examples
Changed plugin manager creation to take a path to where the plugins are
Changed plugin manager to throw if the folder given is wrong
Added getLastPluginError to plugin API
Updated def file for cg

Changed rrPlugins.py to rely on the fact that the rrplugins_c_api.dll is on the system path
Changed lmfit demo to use a simpler model