gui: bug fix: re-estimate acquisition time after reset
Merge branch 'master' of delmic-server.local:odemis
gui: Made acquisition time interval human readible
gui: clean up

remove unused lines
gui/acquisition: save the format and extention of the file

provice the different file formats and extentions, and save in the configuration
file which one were selected.

Make sure that:
 * if the user wants to change the format, it's easy to do
 * if the user wants to use an extension which is not the default one, it's easy to do
Merge branch 'master' of vpn.delmic.com:odemis