Revert "Added Tobias Oetiker's RRD_tool sources and libraries. Created function rrd_call (params like commandline params for rrd_tool binary. Preliminary for rrds)"

This reverts commit de35ee735a2f314d6296121264b17469037339cb.
Revert "/rrd/rrd_call's Makefile"

This reverts commit 81831beb409548c4f52fa9463070c0d872cd15c4.