Update MorphRDBRunner.scala


Pay attention here !

The line 55 indicate the configuration directory. This directory has to exist before the launch of the program. All the different files produced by the program will be saved here. 

The line 56 indicates the config file. As I previously mentioned, all the files used by the program have to be in the configuration directory. So does the configuration file. One just mentions the file name in the program at this line.