Yangman - bugfixes and improvements

Yangman - bugfixes and improvements

- do not consider 'Fill form with ...' checkbox in json view
- prevent loosing data when toggling current view
- stretch up receive data height in JSON view if height of sent data has been
  reduced in order to fill up empty space
- request menu in History and Collections tab has contained request id -
  probably mistake during merge
- request date now correctly respects the time zone in History tab
- enable copy of data from RPC output in Form view & color of output no so
  gray
- strech up Received data height to full available height, in case Sent
  data won't be shown
- show execution time in request tooltip in history tab
- width of input fields adjusted to 100%

Change-Id: I0693df6bcab9456f6162fda3eef2269dc94e1566
Signed-off-by: Stanislav Jamrich <sjamrich@cisco.com>