GDS libname reset to write options libname when using "File/save" #162
Description
This behaviour is somewhat annoying: if you load a GDS file with a libname, say "MYLIB" and use "File/Save" the libname is reset to what is given in the "Writer options". So if the writer options specify a different libname, the original libname is lost.
A better implementation was to use the libname from the writer options only if no libname is given in the GDS file.
