top: reduce minimum terminal width with 2 abreast mode

For the original implementation of the '4' toggle, the
minimum width was set at 165 columns. This was done to
avoid truncations when detailed cpu statistics (versus
graphs) were being displayed. Those can not be scaled.

Upon reflection, it seems more appropriate to give the
user the choice of whether or not to truncate. And, by
reducing that minimum width requirement to 80 columns,
we'll vastly expand potential use of two abreast mode.

[ we'll keep that original as '#define TOG4_NOTRUNC' ]

The patch also updates the man document appropriately.
Along the way, we will trade the potentially confusing
word 'adjacent' for the more natural 'additional' when
detailing the '!' toggle in 4b. Summary-Area-Commands.

Reference(s):
https://gitlab.com/procps-ng/procps/-/issues/172
https://www.freelists.org/post/procps/two-major-changes-to-top

Signed-off-by: Jim Warner <james.warner@comcast.net>

top/top.h

@@ -48,6 +48,7 @@
 //#define STRINGCASENO            /* case insenstive compare/locate versions */
 //#define TERMIOS_ONLY            /* just limp along with native input only  */
 //#define TOG4_NOFORCE            /* no force 2 abreast mode with '4' toggle */
+//#define TOG4_NOTRUNC            /* ensure no truncation in 2 abreast mode  */
 //#define TREE_NORESET            /* sort keys do NOT force forest view OFF  */
 //#define TREE_SCANALL            /* rescan array w/ forest view, avoid sort */
 //#define TREE_VALTMRK            /* use an indented '+' with collapsed pids */
@@ -357,7 +358,7 @@ typedef struct WIN_t {
    char  *findstr;                     // window's current/active search string
    int    findlen;                     // above's strlen, without call overhead
    int    double_up;                   // show individual cpus 2 abreast
-   int    combine_cpus;                // keep combining adjacent cpus
+   int    combine_cpus;                // keep combining additional cpus
    struct pids_stack **ppt;            // this window's stacks ptr array
    struct WIN_t *next,                 // next window in window stack
                 *prev;                 // prior window in window stack