Include spdlog via BaseLib/Logging.h, which
provides macro replacements for
ERR/DBUG/WARN/INFO...

Clang format run on near-the-header lines.

Happy New Year

Especially on iterator types and 'new' allocations.

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'

Also remove the header StringTools.h everywhere.
Add a previously missing sstream include in DateTools.cpp.

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

- binarySearch
- class CPUTime
- class RunTime
- methods/functions from DateTools.{h,cpp}

changes in GeoLib and in SimpleTests folder results from changing the namespace

in order to make the name of libraries, namespaces and directories more consistent the Base directory is know named BaseLib

- added test programm for solving a linear system with CG-method
- time measurement is at the moment OS dependent!
- added Base folder
- added GeoLib folder
- added files in MathLib folder - restructured MathLib folder