Co-authored-by: NFeng Ni <nemonameless@qq.com>

* add senet

* add annotations according to review

* unify log_smooth_windows and log_iter

test=develop

* remove duplicate log_iter

* remain mobile yml, since they are soft-link

test=develop

* sync TrainReader.batch to global train_batch_size

* add iou aware module
* iouaware model zoo
* fix copyright

* add devices_num on reader

* refine capacity value

* refine bufsize

* update YOLOv3_ENHANCEMENT.md
* update IoUloss and DropBlock configs for YOLOv3 related configs

* add iou loss to yolov3
* modify the comment and delete redundant yml file
* fix the low speed bug in dropblock module

* split yolov3 loss

* Polish Reader to simplify preprocessing logic.
#  sample_transforms-> make batch -> batch_transforms in Reader.
* Clean some code
* Imporve yolov3_r50vd_dcn_obj365_pretrained_coco 41.4 to 41.8.
* Update all configs.

* add softnms, nonlocal, resnet200_vd_backbone
* add CBNet
* update model zoo

* update code & doc

* add cascade gn

* add cascade mask gn config

* update configs

* add a global norm_type flag

* add group norm on fpn

* add gn on box head

* add faster rcnn fpn 50 gn config

* add mask branch norm

* update configs

* Add cascade deformable mdoels
* Fix MODLE_ZOO.md

* add save best model & fix dcn configs

* add deformable models
* fix dcn v2
* fix log_iter