no need for memconf, use prtdiag directly

memconf output differs too much between release and solaris versions to
be reliable. Moreover, for the kind of informations we need, it just
echoes back prtdiag output directly. So let's get rid of it, and use
prtdiag directly.
no more need for memconf
new samples
revert to output-dependant regexp parsing

Headers are not constant enough across prtdiag versions to be used
in a generic way. So just identify output format according to memory
section title, and use format-specific regexp to parse content.
transfer prtdiag parsing in Tools::Solaris
parse slots in Tools::Solaris too
new sample
no need to distinguish classes anymore

The only interesting distinction is virtualization.
not needed anymore
cache external command results
more similarity
more factorization
use process instead of a thread for HTTP interface
forking isn't even needed

We just need to avoid running two parallel endless loops.
Merge branch 'master+non_threaded_server'
document more changes, differently

Let's try to make the distinction between agent the agent core and its
various tasks, including the inventory.
Merge branch 'master+memconfectomy'