setup.py: Check that gladeui is installed

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
util: Fix UI file search order

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
setup.py: Fix the path where data files are installed

Signed-off-by: Jerome Flesch <jflesch@gmail.com>
Merge branch 'testing' into wip-optim