Fix copyright notices

license.txt

m4/ax_gsl.m4

matlab/@dynDate/colon.m

matlab/@dynDate/dynDate.m

matlab/@dynDate/eq.m

matlab/@dynDate/format.m

matlab/@dynDate/ge.m

matlab/@dynDate/gt.m

matlab/@dynDate/isempty.m

matlab/@dynDate/le.m

matlab/@dynDate/lt.m

matlab/@dynDate/max.m

matlab/@dynDate/min.m

matlab/@dynDate/minus.m

matlab/@dynDate/ne.m

matlab/@dynDate/plus.m

matlab/@dynDate/subsref.m

matlab/@dynDate/uminus.m

matlab/@dynDate/uplus.m

matlab/@dynDates/append.m