Fix initialization bug in localtime.

Problem reported by Logan Chien in
<http://mm.icann.org/pipermail/tz/2014-January/020534.html>.
* localtime.c (tzparse): Initialize sp->defaulttype to 0.
Fix another 'localtime' initialization bug.

* localtime.c (tzload) [ALL_STATE]: Initialize sp->goback
and sp->goahead even if memory allocation fails.
(tzload, tzsetwall, tzset, gmtsub) [ALL_STATE]:
Use malloc, not calloc, since the !ALL_STATE code has to
work with reused storage anyway.
* NEWS: Document Logan Chien's fix.
Make 'make check_web' work with Ubuntu 13.10 by default.

* Makefile (SGML_CATALOG_FILES): HTML4.cat moved in Ubuntu.
* NEWS: Document this.