pacs codebase local setup
1. change port number in server.js
2. change local mongodb database name in server.js file (create new local database if needed, create one collection named 'patients')
3. change php api in couchdb.js file's callNextAPI function
4. create a non_dicom_file_occur_log.txt file at the root directory if does not already exists, for log generation of occuring non dicom files
5. create upload folder in root folder (all the images are stored here)