[stuff.common.fmatrix] fix warnings
[common.parameter.configcontainer] set warning_output only in debug builds
[common.parameter.configcontainer] use variable warning_output_ only in debug builds, silence warnings
[grid.search] use ReferenceElements instead of deprecated GenericReferenceElements
[la.container.eigen] use BackendType::Index to fix warnings
[la.container.interfaces] fix warning of comparison between signed and unsigned int
[la.solver.eigen] get some values as int instead of size_t to fix warnings
[la.solver.istl] get some values as int instead of size_t to fix warnings
[la.solver.istl_amg] get some values as int instead of size_t to fix warnings
[common.ranges] silence warning
[functions.interface] disable warnings, replace deprecated ALUGrid types
[la.container.eigen] rename Index to IndexType, define UnsignedIndexType to use in comparisons with size_t
[test.functions_*] replace deprecated ALUGrid types
[test.la_container] use FloatCmp::ne instead of != to fix warning
[common.ranges] updated dune-fem includes
[common.configtree] added special get() for rx1 and 1xc matrices
[functions.constant] fixed default_config() for matrix-valued case
[common] moves thread manager into "parallel" subdir
[common.parameter.configcontainer] style fix
[common.parallel.threadmanager] replace deprecated include