This reverts commit 9411e875.

Always install bash completions into the directory provided by pkg-config (and get rid of the extra variable)

Two configurable options:
- wait for zones to be loaded before starting (default)
- start server and load zones in the background (asynchronous-start on)

not sure where to put configuration string doc for each module

ref #195

refs #158

Set to 10800s (see reasoning in issue #155).

refs #155

resolves #221

refs #4

refs #4, #169

refs #159

Main changes:
* 'system.hostname' config option is deprecated
* 'system.identity' is used for 'id.server' and 'hostname.bind'
* 'system.version' is used for 'version.server' and 'version.bind'
* In addition, config options (and NSID) support boolean on|off
* When on, the automatic default is filled on config load:
  * FQDN hostname (or at least hostname) for NSID and system.identity
  * Version string for system.version

The config options are still turned off by default.
refs #113