lowered memory consumption by 60% and increased speed by 30%; there is still some room for improvement especially in first_entry_t; need to check if chart is shifted
documentation and fixed a rounding bug
settled all issues; added more options; final tests for merging into production
removed all printf from the json data generation; now it is twice as fast
Merge pull request #6 from ktsaou/new_rrd_stats

Half the memory!
Twice the speed!