fix test_duplicates

 - Check fname rather than path for starting with '.#'

Change-Id: I962e466d2621143357dad5a87538adc783393812
first test for CrawlMail

Change-Id: I65d58803d520cd5001719d25a54d5e9fda55fe75
Add config file name to option/section errors, with tests

Change-Id: Ib8f9eb9007f18419c450a30253de55aab9f8d9f8