Werk #3318: CSV bulk import of hosts: fix handling of CSV column headers

Component	Setup
Title	CSV bulk import of hosts: fix handling of CSV column headers
Date	Mar 22, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.2.8b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Reenable the feature of automatic detection of the correct column. Remove bogus {{None}} headers if headers are disabled.

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