LoadMeter: dynamically adjust color and total of bar

Change the color and total based on the actual 1min load value:

    < 1         : green and total of 1.0
    < cpu-count : yellow and total of cpu-count
    else        : red and total of 2*cpu-count

Closes: #32
diff --git a/Meter.h b/Meter.h
index cb05405..2a78fd1 100644
--- a/Meter.h
+++ b/Meter.h
@@ -100,6 +100,7 @@
    int h;
    const ProcessList* pl;
    uint8_t curItems;
+   const int* curAttributes;
    double* values;
    double total;
    void* meterData;