fixes completion position and makes the popup bigger
adds config mechanism that loads a second level of default values from a file.
you can now simply write often used flags to a file:
$ echo -e "#start web ui by default\n-http" >> ~/.golab/flags.conf
you can still override these defaults:
$ golab -http=false
and also select a different config file:
$ golab -conf ~/.golab/https.conf