Windows installer musings

[Rod Widdowson]

Just to FU on what I said on the call.  I had it in my mind that all
user-changeable stuff is under conf, this of course is wrong:

- Conf/flows/templates are left alone ("only copy in if new")

- Metadata/logs/cred - populated empty any generated content left as (a
degenerate case of the below).

- The others (bin/doc/jetty-base/misc/system/war) would be "updated"
(created files left 'as is', others removed and replaced):

The war directory worries me slightly because that is where jsp files goes
and we need to have a plan about that.  Might we actually put the jsp file
(and anything else which needs to go into the war) somewhere else
(war-template?) and let the installer overwrite to war contents?  We could
then use the same technique to allow people to over-write web.xml.  This is
not unlike what we hacked into V2 to preserve web.xml

There is also the issue about war creation for those who are unable by
choice of container to use an exploded war.

Rod