aquaero: Include aquaero plugin in config files.

Adds the aquaero plugin into the build system.
aquaero: New Aquaero sensors plugin

This plugin adds support for the Aquaero 5 sensors.
aquaero: Fix sensor names

This patch replaces some sensor names to more reasonable ones.
aquaero: Documentation for aquaero plugin.

This patch includes the manpage, smaller config sample file and
the README and AUTHORS description.
aquaero: Fix AC_CHECK configure setting for libaquaero5.
configure.in: Check for the libaquaero5.o file in "obj/".

This is what the aerotools-ng Makefile is currently using.
aquaero plugin: Some coding style fixes.

* Break long lines.
* Rename temperatures. The type instances are now "sensor", "virtual",
  "software" and "other".
* Rename "flow-flow" to "flow-sensor".
aquaero plugin: Use the "complex" configuration.

Actually less LOC.
README: Add dependency "aerotools-ng".
collectd.conf(5): Improve markup of the aquaero plugin.
Merge branch 'ad/aquaero'