Channel Preferences

#24 (closed), #45 (closed)

• Fix bug caused by changing variable names to meet with PEP8.
• Change name to be more descriptive.
• Select row when edit a widget on row.
• Help user to have bigger room for editing SOH channel list by clicking on EDIT button to open a separated editing dialog.
• With RT130 ask user to add SOH channel list form DB when they try to scan from data set.
• Report not found SOH channels in log.
• RT130: not read channels that aren't requested.