getting rid of the user data directory
introduce addStudy and add more fields to be dumped from dicom header
wip: update study in db * todo: update location and patient age
wip: sth wrong with first image of a study: 20080722-US_SPINE-0/  2008-07-22-US_SPINE-57/
fix first image of study bug
age is a string
code cleaning
add age and location in study table