add check for validity, readability of PATENTROOT directory
add check for validity, readability of PATENTROOT directory

yngcan/patentprocessor,funginstitute/patentprocessor,funginstitute/patentprocessor,nikken1/patentprocessor,yngcan/patentprocessor,funginstitute/patentprocessor,nikken1/patentprocessor,yngcan/patentprocessor,nikken1/patentprocessor