[BoostXmlCndInterface] Changed sig. of virtual Writer::write().
[BoostXmlCndInterface] Made reading/parsing of geometry tag xml more clear.
[BoostXmlConditionInterface] Added CondType _type to decide what type of condition should be written.
[BoostXmlCndInterface] explicit to constructor.
[BoostXmlCndInterface] Removed most of the write() method.
[BoostXmlCndInterface] Test functionality.
[BoostXmlGmlInterface] Removed parameter name to fix warning.
[BaseLib] Set path for test data in Configure.h.in to the cmake generated path.
[BoostXmlCndInterface] Unused CondType / setConditionType() removed.
[XmlCndInterface] Use initGeometricAttributes().
Merge pull request #320 from TomFischer/XmlIO_FEM

Xml IO for reading boundary condition using boost
Merge branch 'master' of https://github.com/ufz/ogs into petsc_vector
Update comments by the comments from Tom and Dima