removed previous iterative rounding codes

[komietty]

Removing the previous iterative rounding code in the integrate.h which is duplicated with iterative_rounding.h.

[komietty]

Sorry, this includes some setting file updates. I recreated another PR.

[avaxman]

Thank you for this. I have to think about it, but in fact this gets overridden by the upcoming (hopefully in two weeks) version of Directional where I totally removed the "optimization" and only left this code... in addition, the part that reduces the rank of C is vital nonetheless, and cannot be removed.

[avaxman]

You can check it out in the "remove-dependencies" branch, which is working up to integration including---currently working on the 505 meshing (which requires heavy code writing to supplement CGAL).

[komietty]

@avaxman Thank you for the reply! I'm glad to hear that this project will be upgraded. I checked the libigl-free branch and the codes in integrate.h which seems great. As for the rank reduction of the constraint matrix, I thought the same thing was done when creating CSmall matrix inside SIInitialSolutionTraits::init() (I have checked that the same matrix was generated), but you are right, it is better to have pre rank reduction beforehand.