* correct the part about fixed aspect
* improve formatting
* add snippet markers to source
* replace inline code by @snippet
- do not run calibration twice when using a imageList
- make output consistent in itself (CamelCase vs no_camel_case) as well as with old camera calibrate sample
- respect write extrinsic/ points flags
- set the aspectRatio value when specified
- fix writing of calibration settings. also update grammar.
- fix intendation and remove some size_t -> int casts by using size_t
