Fixed implementation of fexists. #85
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g++ 6.2.0 (Ubuntu Yakkety) rejects the current implementation with the
following message:
```
cannot convert 'std::ifstream {aka std::basic_ifstream<char>}' to 'bool' in return
```
An explicit call to the `good()` method of `ifstream` takes care of
the problem.
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g++ 6.2.0 (Ubuntu Yakkety) rejects the current implementation with the following message:
An explicit call to the
good()method ofifstreamtakes care of the problem.