Fixed Doxygen errors in BasicMathematics folder (Issue #690)

git-svn-id: file:///srv/svn/repos/tudat/trunk@538 ac7aa084-b6da-11df-bf42-7fac39f0224f
Fixed Doxygen errors in Gravitation folder (Issue #694)

git-svn-id: file:///srv/svn/repos/tudat/trunk@539 ac7aa084-b6da-11df-bf42-7fac39f0224f
Fixed miscellaneous errors in Doxygen documentation; updated Doxyfile.in

git-svn-id: file:///srv/svn/repos/tudat/trunk@540 ac7aa084-b6da-11df-bf42-7fac39f0224f
Added static Lorentz force and acceleration free functions (Issue #709)

git-svn-id: file:///srv/svn/repos/tudat/trunk@541 ac7aa084-b6da-11df-bf42-7fac39f0224f