this is just the result of
```
find -iname "*.[ch]pp" | xargs sed -i "s/ *$//"
find opm/parser/share/keywords -type f | xargs sed -i "s/ *$//"
```
so if it causes conflicts with other patches, the others should get
priority. The rationale behind this patch is that some people tell
their editor to remove white space which leads to larger than
necessary patches...
Parser::parseData is quite useful for unit tests to prevent them
spilling files to everything. Also, what was formerly
Parser::parseFile has been renamed to Parser::parseStream and slightly
modified to not be specific for std::ifstream.
