Added first version of Section class
Added a few tests
Some more logic added to the Section class
First version of XyzSection classes implemented - based on Section class
Some code cleanup in XyzSection classes
Added some iterator support in KeywordContainer and Section. Not finished.
Commented out failing assert in KeywordContainerTests
Minor adjustments in Section[Tests], Schedule and KeywordContainerTests
Added missing #include <iostream> in two tests.
Merge pull request #151 from AtleH/sectionclass

New Section class