First work on returning service XML
Returns service XML now
Document service command
service XML: avoid wrapping service element

and just return service XML as is (it already has a service element
as root).
Fix memory leak in service command
Fix leak WRT client ref count
Remove dead code WRT client total counting
Facility for test script to post-wait

If WAIT_PAZPAR2 is set, it defines number of minuters to wait
before shutting down pazpar2 daemon for test.
session/client counting utils to header
Reformat
Tweak log msg for http sessions use
Time HTTP requests
Change logging of HTTP response
Update NEWS
Change repr of service XML

from XML nodes to serialized (string). This reduces memory overhead
for service structure considerably.
Use YAZ' new icu_iter_get_org_info for snippets
Snippets: multi words; less logging
Tests using snippets
Require YAZ 4.2.58

due new functions icu_iter_get_org_info and icu_chain_get_org_info.
No longer build for Ubuntu natty