clean up external packages in v2 laboratory

applications/Laboratory/V2/ext/export_fig.m

applications/Laboratory/V2/ext/export_fig/LICENSE

applications/Laboratory/V2/ext/export_fig/copyfig.m

applications/Laboratory/V2/ext/export_fig/export_fig.m

applications/Laboratory/V2/ext/export_fig/ghostscript.m

applications/Laboratory/V2/ext/export_fig/isolate_axes.m

applications/Laboratory/V2/ext/export_fig/print2array.m

applications/Laboratory/V2/ext/export_fig/print2eps.m

applications/Laboratory/V2/ext/export_fig/user_string.m

applications/Laboratory/V2/ext/export_fig/using_hg2.m

applications/Laboratory/V2/ext/findobj/findjobj.m

applications/Laboratory/V2/ext/findobj/license.txt