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[CSV-239] Add CSVRecord.getHeaderNames and allow duplicate headers (#41)

* [CSV-239] Cannot get headers in column order from CSVRecord.
* getHeaderNames returns all headers in column order including repeats which are allowed as per RFC 4180
* add CSVFormat.withAllowDuplicateHeaderNames()

* [CSV-239] Cannot get headers in column order from CSVRecord.
* only wrap headerNames with unmodifiableList if non-empty
* fix and enhance CSVRecord.toMap javadoc

* [CSV-239] Cannot get headers in column order from CSVRecord.
* fix exception messages

* [CSV-239] Cannot get headers in column order from CSVRecord.
* fix whitespace

* [CSV-239] Cannot get headers in column order from CSVRecord.
* simplify if statement

* [CSV-239] Cannot get headers in column order from CSVRecord.
* fix indentation
* add javadoc to Headers class
* rename method to createHeaders
* use String.format to build error message
* initialize header names List with appropriate size

28 of 28 new or added lines in 2 files covered. (100.0%)

889 of 979 relevant lines covered (90.81%)

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