#24 if fileName==True of nansat.write_figure and backend is 'agg', switch to QT4Agg. And fix a bug in write_figure().
Merge branch 'develop' of github.com:nansencenter/nansat into issue24-ipython-show
#24 If plt.backend=='agg', switch to 'QT4Agg' in PointBrowser.__init__().
#24 remove unnecessary import.
Merge branch 'develop' of github.com:nansencenter/nansat into issue24-ipython-show
remove imports from function body; make wiser try/except in Nansat.write_figure
#24 add a warning if python is with -pylab and retun None
Merge branch 'issue24-ipython-show' into develop