Qserv in-place install works.

Improvements in template management:
    - clearer separation between installation and configuration templates,
    - meta-configuration file renamed to qserv-meta.conf,
    - templates installed in cfg/ instead of admin/ in order to allow in-place install.
In configuration module, template values dictionary generated using
meta-configuration file is now computed only at the first time it is used
and then put in cache.