Bug: wrong processing of string that contains separator symbol

[iamantony]

Based on this comment: http://stackoverflow.com/questions/22802491/create-csv-file-in-c-in-qt/30391988?noredirect=1#comment57510719_30391988

When data string contains separator symbol, writer (and reader) will split it in two different strings.
Example:
Separator: ","
Input: "one", "two", "str with, comma"
What we want to see in file: one,two,"str with, comma"
What we get: one,two,str with, comma

Solution: check if data string contains separator symbol. If yes, then we need to add double quotes at the begining and at the end of the date string.

[iamantony]

Read the standard RFC 4180: http://tools.ietf.org/pdf/rfc4180.pdf

[iamantony]

This also may help: http://csvlint.io/about

[iamantony]

Fix bug for Reader: 2d4bddc

[iamantony]

Fix bug for Writer: 0cff93d