msole: plug leak
Blobs: reduce CRITICALs.

Once we have complained about a file being corrupted, we should not
produce an avalanche of CRITICALs.
vba: plug leak.
GsfInputMemory: plug leak.
vba: catch lookback beyond buffer.

The buffer is used in a wrap-around way, but we should not allow lookbacks
to go beyond the initial window.
gsf: plug leak.
Introspection.
Zip: Properly read archives with 64k-1 or more members.

Also speed up things for the lots-of-members case.
Zip: handle files larger than 4G.

Also fix various 64-bit issues.
GafInfileStdio: speed up case of large number of files
Updated Czech translation
Updated Polish translation
gsf: plug leak.
zip: fix file mode
zip: fix reading extended fields for zip64.
Zip: fix typo for reading certain zip files.

This somehow affected xlsx files more than other files.
zip: first cut at writing zip64.

This automatically handles the more-than-64k-files cases.

The large file case is trickier and not fully handled right now.  The
problem is that we need to know in advance if the length will be larger
than 4G or, alternatively, we must unconditionally use zip64 format.
The problem is, we don't know if our consumers can handle it.  No
released version of libgsf to date can handle it, for example.
gsf: cleanups.
zip: by default, use zip64 when needed

We invent an "ingore" field for purposes on having a predictable header
size before we know the member size.
Updated Czech translation