top: optional wider non-scalable cols

This commit accommodates those fields which may have
suffered truncation due to these default limits:
  . 5 digits for uid/gid type fields
  . 8 characters for user/group type fields

With a new interactive command, users can increase the
width of all such fields, or return to the defaults.

Note:
   There are no restrictions on the amount added to
   the defaults.  The user is free to vastly exceed
   screen limits which simply means such fields can
   never be displayed.

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

top/top_nls.h

@@ -80,6 +80,7 @@ enum norm_nls {
    THREADS_show_fmt, TIME_accumed_fmt, UNKNOWN_cmds_txt, UNKNOWN_opts_fmt,
    USAGE_abbrev_txt, WORD_allcpus_txt, WORD_another_txt, WORD_eachcpu_fmt,
    WORD_process_txt, WORD_threads_txt, WRITE_rcfile_fmt, WRONG_switch_fmt,
+   XTRA_fixwide_fmt,
 #ifndef WARN_CFG_OFF
    XTRA_warncfg_txt,
 #endif