Changed the header area widget installation mechanism to something more robust.

9 jobs for customizeableSidePaneArea in 77 minutes and 54 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed clang-c++11-Qt4 #6017
Linux MultiThreads

00:07:32

passed clang-c++11-Qt5 #6021
Linux MultiThreads

00:08:51

passed clang-c++98-Qt4 #6019
Linux MultiThreads

00:05:48

passed clang-c++98-Qt5 #6023
Linux MultiThreads

00:07:26

passed cppcheck #6024
Linux MultiThreads

00:34:02

passed gcc-c++11-Qt4 #6016
Linux

00:03:27

passed gcc-c++11-Qt5 #6020
Linux

00:04:06

passed gcc-c++98-Qt4 #6018
Linux

00:03:40

passed gcc-c++98-Qt5 #6022
Linux

00:02:59