89-Add the comment to ImportManager

Added the comment for retrieveUnit method that copy from UnitManager.
Merge remote-tracking branch 'robworth/develop' into features/89-Clean-Up-PV-Logs
138-Superadmin-adds-radar-group

Fixed the code style problem.
Merge remote-tracking branch 'robworth/develop' into features/138-Superadmin-Adds-Radar-Group
Merge pull request #57 from richardli5945/features/89-Clean-Up-PV-Logs

Features/89 clean up pv logs
Merge pull request #56 from richardli5945/features/138-Superadmin-Adds-Radar-Group

Features/138 superadmin adds radar group