1) add urban geometric data options and standardize data file and var names [by @Wenzong Dong]; 2) refine urban model dependence; 3) add descriptions for LULCC adding variables [by @Wanyi Lin].

1) add urban geometric data options and standardize data file and var names [by @Wenzong Dong]; 2) refine urban model dependence; 3) add descriptions for LULCC adding variables [by @Wanyi Lin]. #284