Removed some very old and obselete disclaimers about threads.
Set trace_level in low_init_interpreter(), so that it is valid in all
interpreters.
release number bumped to 594 by export.pike
release number bumped to 595 by export.pike
Check for configure scripts built with pre-propagated_variables pike.
* GtkTreeIter needs get_pg2object() instead of get_gobject()
* fixed GtkTreePath because it is not a GObject
Locale.Charset: Fixed NULL-dereferencing in the decoder for EUC-CN and EUC-KR.

Thanks to 郭雪松 <zenothing@hotmail.com> for the bugreport.
Locale.Charset: GB2312 should typically be treated as EUC-CN.
release number bumped to 596 by export.pike
release number bumped to 597 by export.pike
ZXID: Initial implementation.
ZXID: Fixed some bugs in the pmod wrapper.
ZXID: Avoid freeing some statically allocated strings.
ZXID: fixed autodoc
ZXID: Survive being without the cmod.
ZXID: Fixed memory leak and added workaround for broken header file.

Fixes malloc memory corruption caused by zxid_init_conf().
ZXID: Now initializes the curl bindings properly.

Fixes SEGV with old curl.
ZXID: Added Configuration()->idp_list().
ZXID: authenticate() now returns a parsed result in some cases.