* Implemented the `multicombinations` function
* Write unit tests for `multicombinations` function
* Integrate the `multicombinations` function throughout codebase
1. Include multicombinations factory function in factoriesAny.js and factoriesNumber.js
2. Write embedded docs for multicombinations
3. Added latex support
4. Refer to multicombinations in the "see also"-section of related functions
* Change name from `multichoose` to `combinationsWithRep`