Own open dialog, with options (non func)

Own open dialog allows to set specific center for molecule and calls the
open file dialog itself. The choosen settings have to be returned to
molconv main window (not programmed yet).
added dialog settings for new basis
set intbasis without complete configuration object

new setintbasis and two enums for origin and basis.
set second radio buttons and get methods for origin and basis
test call to set intbasis (currently disfunctional)
Merge branch 'open_dialog' of github.com:janvc/molconv into open_dialog
added prove for open dialog (the atoms for basis must differ)