mdpstats_: use 'stats' instead of 'version' in autoconf.
As of v0.21.4 version of the MPD command protocol, it seems that the`version` command is not valid:
$ echo version | /bin/nc localhost 6600 OK MPD 0.21.4 ACK [5@0] {} unknown command "version"...
Restructure incomplete or broken "autoconf" implementations
Some plugins with non-zero autoconf exitcodes (it must be zero instead)deserved a bit of code cleanup for improved readability.
rename plugin example graphs for plugin gallery visualization
Some example graphs did not follow the naming convention required by theplugin gallery.
Category Tree: Reduce number of categoriesmonit -> muninnova -> cloud (nova)powermta -> mail (powermta)redis -> search (redis) and system (redis)
[mpdstats_] allow unconfigured usage (all stats)
[mpdstats_] use 'which' for finding 'nc'
[mpdstats_] remove "-q" from netcat call (Closes: 576)
mpdstats_: fix example documentation.
New plugin: mpdstats_.
