Added support for caching.  Most of the code is in www_lib_init(), there is also a modification to read_url() to make use of the cache if it is enabled.
Added support for caching.  Most of the code is in www_lib_init(), there is also a modification to read_url() to make use of the cache if it is enabled.


OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap