top: use CPU_ZEROTICS to embrace the Nehalem logic

The recently added logic dealing with "missing" tics
is mutually exclusive with logic associated with a
define called CPU_ZEROTICS.

This commit expands the use of that define to exclude
such Nehalem logic as appropriate.

It also extends programmer notes in top.h to include
an attribution for initiating the topic of potential
Nehalem type % CPU distortions, acknowledging:
  Jaromir Capik, <jcapik@redhat.com>

References
commit ce1410a51a
commit 9e7dd43ab7
commit a9041a5526

top/top.c

@@ -1826,13 +1826,14 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
    cpus[Cpu_faux_tot].cur.tot = cpus[Cpu_faux_tot].cur.u + cpus[Cpu_faux_tot].cur.s
       + cpus[Cpu_faux_tot].cur.n + cpus[Cpu_faux_tot].cur.i + cpus[Cpu_faux_tot].cur.w
       + cpus[Cpu_faux_tot].cur.x + cpus[Cpu_faux_tot].cur.y + cpus[Cpu_faux_tot].cur.z;
+#ifndef CPU_ZEROTICS
    /* if a Nehalem type cpu has been turned off completely, and thus registers
       very few total tics, we'll force it to be treated as idle when that total
       falls below a % of those expected -- other cpus will register their full
       number of expected tics as 'idle' and thus won't be effected */
    cpus[Cpu_faux_tot].edge =
       ((cpus[Cpu_faux_tot].cur.tot - cpus[Cpu_faux_tot].sav.tot) / smp_num_cpus) / (100 / TICS_EDGE);
-
+#endif
    // now value each separate cpu's tics, maybe
    for (i = 0; i < Cpu_faux_tot && i < Screen_rows; i++) {
 #ifdef PRETEND4CPUS
@@ -1850,7 +1851,9 @@ static CPU_t *cpus_refresh (CPU_t *cpus) {
             memmove(&cpus[i], &cpus[Cpu_faux_tot], sizeof(CPU_t));
             break;        // tolerate cpus taken offline
       }
+#ifndef CPU_ZEROTICS
       cpus[i].edge = cpus[Cpu_faux_tot].edge;
+#endif
       // this is for symmetry only, it's not currently required
       cpus[i].cur.tot = cpus[Cpu_faux_tot].cur.tot;
 #ifdef PRETEND4CPUS