Improve drop file extension

Improve histogram code

New protected init().

added some libraries to link with for generateStructuredQuadMesh, added new programme createMeshElemPropertiesFromASCRaster

added public method Raster::getRasterPixelDistance(), bugfix for Raster::refineRaster() - update now internal attributes

changed dropFileExtension() implementation

BaseLib filename string manipulation rewrite.

Place it in StringTools.

Use extractBaseName() now.

And also add ExtractBaseNameWithoutExtension tests.