fixes #9795 - check if mail is enabled before sending a notification

(cherry picked from commit 7ca39b3442be76da89c2c52d8da0c2d6afb74af1)

fixes #9856 - include locations and organizations in user output

(cherry picked from commit 4d7294767840da554b382b6c37d080870537509b)

Fixes #8779 - add vlanid to subnet ENC

(cherry picked from commit a899d97175c683bb648e3cbd34d0aebcae1252cf)

Fixes #9842 - rename the register method which deprecates the old one

(cherry picked from commit 0a30da74a18c21a0f8755fb45d904e4f0b4a52a5)

Fixes #9787 - correctly typecast default values

JSON and YAML default values were double typecasted, once by active
record and then by value_of_key method.

(cherry picked from commit a2468540b62942a2a9adfb428003d5308df7ab56)

Fixes #9827 - compute resource info in API doesn't send provider type

(cherry picked from commit 867db9522cd57175eb896b753c9d1de9ed2b41ea)

Fixes #9589 - Add documentation button to various models

(cherry picked from commit 8eed13de1dd3b4bc10e360427854041e236ae959)

Fixes #6454 - Display error message when user_data is needed but not set

(cherry picked from commit b99708ac7a1bb0e139505c2549c0f36fa5a65f83)

fixes #4424 - overriden attributes get overridden in the UI

(cherry picked from commit 0575b5b0a07c59c443bf2be663cb67d6a5e40f19)

i18n - extracting new, updating rails, pulling from tx