Need Optional parameter for Keypoint class as we have one for BoundingBox

In case, we want to track the Keypoint transformations and pickout the labels which we want to use, It would be useful if we add label parameter.

As of now, we can do something like the below code in BB's :
`ia.BoundingBox(
x

We have a lot of repetitive instances in our data and it a simple Copy/Cut - Paste (Ctrl+C/X and Ctrl+V) function for bounding boxes would help speed up labelling by a lot!

Edit: Also multi-selection of multiple boxes/geometries would be great for a faster workflow

Docs about dest param :
"You can pass all parameter same (this is similar to m1 *= m1), you can pass dest as m1 or m2 (this is similar to m1 *= m2)" (c)

But some functions behave differently. For example:

vec3 A = {0,0,2};
vec3 B = {2,0,0};
glm_vec3_cross(A, B, A); // A = {0, 4, -8} was expected A = {0, 4, 0}

Describe the bug
When having 12 users and switching to the second page of the user view, the tabel is inconsistent. The user names are correct, but the other columns are filled with information from the first page. I didn't try to modify them.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Users' menu
2. add 11 or more users
3. go to the second page of the user list
4. Se

I find your tool very useful, however when annotating objects close to image edges, it is very easy to drag the bbox outside of the image. Adding a small feature to keep the bbox within the image would be appreciated.

This affects the COCO and Pascal VOC exporters. Currently the output class ID is dependent on the order in which they were created in deeplabel. It may be preferable to, in some cases, force this to something else, for example provide a pbtxt file like https://github.com/tensorflow/models/blob/master/research/object_detection/data/mscoco_label_map.pbtxt

The darknet exporter does not have this p