Fix memory corruption bugs in WCSLIB/wcscopy for WCS-TAB
Fix memory corruption bugs in WCSLIB/wcscopy for WCS-TAB

pllim/astropy,dhomeier/astropy,mhvk/astropy,mhvk/astropy,pllim/astropy,pllim/astropy,dhomeier/astropy,lpsinger/astropy,mhvk/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,lpsinger/astropy,astropy/astropy,larrybradley/astropy,astropy/astropy,StuartLittlefair/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,pllim/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,saimn/astropy,mhvk/astropy,astropy/astropy,StuartLittlefair/astropy,mhvk/astropy,StuartLittlefair/astropy,saimn/astropy,StuartLittlefair/astropy,lpsinger/astropy,astropy/astropy,lpsinger/astropy,saimn/astropy,saimn/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,larrybradley/astropy,dhomeier/astropy,astropy/astropy,pllim/astropy,saimn/astropy,StuartLittlefair/astropy