Add probability distribution

[Reneh107]

A structure is setup with a baseclass called probabilityDistribution.

Several derived classes are developed and tested:
uniform 1d
gaussian 1d / multi-D
Gaussian copula
Lognormal distribution

Functions are:
getProbabilityDensity
getCumulativeProbability
getQuantile

[DominicDirkx]

Hi Rene,

I've uploaded a modified version of my own probability distribution code:

https://github.com/DominicDirkx/tudat/tree/ProbabilityDistributions

It's been modified to be able to handle multivariate distributions. I'll get to work on merging the functionality with yours. Interestingly, the base class design is really very similar, so merging them shouldn't be too hard.

[DominicDirkx]

Hi Rene,

I've created a new branch in which I've merged your code and mine:

https://github.com/DominicDirkx/tudat/tree/Reneh107-add_probability_distribution

It's still preliminary, but if you have any comments, just let me know,