Note that it is already included in our
readlicense_oo/txt/license.txt, so we presumably have fulfilled the
license's requirements. Just adding the text in twain.h, too, for
helpfulness.

Handle Move Sheet correctly

support copying from an unsaved document and some improvements

still problems with MoveTab and missing dialog box if we have external
refs to unsaved docs while we save

adjust named ranges formulas too

little problem here:
tab absolute and  col/row relative is tricky, the col/row is calculated
relative to the cell where the range name is used but we don't know in
which cells the range name is used
The other office solves that by making only references pointing to
sheets that are not copied external (this solution is not perfect)

gb_LinkTarget__get_installname should append the SOVERSION, because the
installation set only contains the versioned libraries, not the
unversioned symlinks.

the storing in archive directory was non-standard solution => gets removed
also the code was simplified and clean up a bit

there is not longer needed the manualy created blacklist of copied files;
also no need to remove symlinks from clone subdir

use "tar --checkpoint-action=exec="echo -n \".\"" instead of
"awk '{ ORS=\"\" ; if (++nlines\%50 == 0) printf \".\"; fflush() }'";
we are interested into the return code from tar, e.g. not-enough disk space

typedetection doesn't know about 999 COMMENT, it should really.

More tests might be affected.  Also unclear to me whether it is always (only)
localedata_en, or whether it could also be _es/_euro/_others.