Only add configuration name if it does not already exist

[samlamont]

Adds logic in fetching to:

• check if configuration name exists in the configurations table
• automatically adds configuration name if it does not exist in the table, if it does exist continue with loading
• remove add_configuration_name flag since it seems unnecessary and could cause problems. I can't think of a reason why the name shouldn't be added if it doesn't exist, since validation will then fail

Resolves #397

[samland1116]

code updates seem clear and concise, tests pass on my end