[rfc][icedtea-web] tuning of properties loading

[Jiri Vanek]

By hitting https://bugzilla.redhat.com/show_bug.cgi?id i realized, that we made an serious error by not dying on ConfigureException.
This patch is fixing it. It also fix an bug, when  deployment.system.config.mandatory is true, and invlaid url is proposed.
It also add few cosmetic changes
  - few docs
  - better error reporting from loading the global config
  - better handling of non fatal (==non ConfigureException) ) exception
    - logged
    - defautls are used
    - if it is not processed, then instantiation error is thrown instead, which is not much helpful...

The reproducers for this are hardly to be possible, as both global files needs root permissions. However some unitsts will be hopefully possible.

Thanx,
   J.
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