Added strong inlines required for MSVC for proper inlining.
Added specializations for DiagonalMatrix products to RotationBase.
Added left- and righ-hand-side products with DiagonalMatrix to Transform.
RHS Transform products now return Matrix objects only.
Split the geo_transformations unit test. Some tests were not made for projectivities.
Removed unused variables from main.h that caused warnings.
* Add short documentation for Array class
* Put all classes explicitly in Core module (where applicable)
* Section on Modules in Quick Reference Guide
* Put Page 7 after Page 6 in Contents :)
