[FIX] made arguments and methods in BSpline2d const (if possible)
[NOP] updated test with new method signatures
Merge pull request #1051 from aiche/fix/const-correctness-for-bspline2d

[FIX] made arguments and functions in BSpline2d const (if possible)
Merge branch 'develop' of https://github.com/OpenMS/OpenMS into bspline

Conflicts:
	src/openms/include/OpenMS/MATH/MISC/BSpline2d.h
	src/openms/source/MATH/MISC/BSpline2d.cpp
	src/tests/class_tests/openms/source/BSpline2d_test.cpp
[FIX] removed unneeded include of 'Param' header
[API] made 'TransformationModel::evaluate' const again (after update in BSpline2d)