EXT-8299 FIXED Added rearranging of the group accordion to fit all space if...

EXT-8299 FIXED Added rearranging of the group accordion to fit all space if only General tab is visible.

Also fixed name of accordion in code to be consistent with xml.
Replaced findChild with getChild (when getting accordion and its tabs) to avoid extra checks against NULL of returned pointers
 and have warnings in log is xml is not consistent with code.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/798/

--HG--
branch : product-engine