Updates: Mention SoupSessionFeature (and link to SoupLogger,
* docs/reference/client-howto.xml: Updates: Mention
SoupSessionFeature (and link to SoupLogger, SoupCookieJar, and
SoupProxyResolverGNOME specifically). Mention forms and XML-RPC
support. Mention header-parsing methods. Give a concrete example
of connecting to SoupMessage signals. Document the (minimal)
thread-safety guarantees
* docs/reference/build-howto.xml: basic notes on pkg-config and
#include usage.
svn path=/trunk/; revision=1238