Clang format run on near-the-header lines.

Happy New Year

This is also untested and not compiled anywhere because of the undefined
macro MSVC.

This is automatic replacement with
ag '(?<!std::)size_t(?!\w)' --ignore-dir=ThirdParty -l | xargs perl -pi.bak -e  's/(?<!std::)size_t(?!\w)/std::size_t/g'

When attributes are missing the corresponding element is outputted in
a JSON representation. Therefore I added
BaseLib::propertyTreeToString(boost::property_tree::ptree const& tree)

Fixes #590.

This is done for potential and obvious file streams.

This closes #87.

Place it in StringTools.

moved functions getFileNameFromPath(), getSuffixFromPath(), copyPathToFileName() and extractPath() from files StringTools.{cpp,h} to files FileTools.{cpp,h}

moved functions trim(), replaceString(), splitString() and template functions number2str() and str2number() into namespace BaseLib

added recent changes concerning the attachment of time series sensor data to station objects from ogs5 to ogs6, added RapidXml as a small library for reading XML files from console application, added existing xml schema files

This reverts commit 05677165.

Conflicts:
	FileIO/XmlIO/XmlGspInterface.cpp
	README.md