Adding path for pickle file to save last know date stamps

Working properly on the following system configuration:
CentOS release 6.6 (Final)
Python 2.6.6
Rsnapshot config_version 1.2

First Production ready release

Working properly on the following system configuration:
CentOS release 6.6 (Final)
Python 2.6.6
Rsnapshot config_version 1.2