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merged
operator[]
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Merge pull request #116 from rupnikj/TStr

T str
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Merge branch 'TStr' of https://github.com/qminer/qminer into TStr
fix
Removed operator=(char) from TStr as it was nice place for making bugs (e.g. TStr a; a = 0;)
Removed TStr(char, char) as nobody used it. TStr(char) was fixed so that in case char==0, it creates empty string.
Merge pull request #119 from blazf/TStr

Reverting parts of API, removed some dangerous constructors and operator= in TStr.
Merge pull request #118 from lstopar/TStr

T str
NULL replaced with nullptr