* Fix latex repr of nested variables
* Do not put \operatorname inside \text
* Remove inner $ symbols from latex representations
* remove them from the string borders since they always represent the math environment
* fix tests to check the correct behavior
* Add test for a full model that used to be rendered wrong
* Use "\\operatorname{" instead of "operatorname" to determine if the latex command is used
* Update tests to new distributions' notation