release number bumped to 8.0.16 by export.pike
release number bumped to 8.0.17 by export.pike
ZXID: Fixed some build issues.

One use of parent_storage() was missed when the API was changed.

Some places where missed when the precompiler started prefixing
symbols with the module name.
release number bumped to 8.0.18 by export.pike
release number bumped to 8.0.19 by export.pike
ZXID: More build fixes.

Missed a few spots...
release number bumped to 8.0.20 by export.pike
release number bumped to 8.0.21 by export.pike
Updated touch syntax. From Magnus Holmgren
gmp.h defines c++ things if compiling with a c++ compiler.

However, pike include files have to be included inside an extern "C".

So, use extern "C++" when including gmp.h from pike includes.
Fix bug where the write callback could be dropped if 0 bytes were written.
ZXID: Some support for ZXID 1.19 and later.

Some fields in struct zxid_conf changed names in ZXID 1.19:2013-12-04.