top: add a flexible 'Inspect' capability

This commit introduces an extremely powerful, flexible
brand new capability.  Now, users can pause the normal
iterative display and inspect the contents of any file
or output from any script, command, or even pipelines.

It's invoked via the 'Y' interactive command which, in
turn, is supported with simple user supplied additions
as new entries in the top personal configuration file.

A separate new 'Inspect' window supports scrolling and
searching, similar to the main top display.  Except it
extends existing 'L'/'&' (locate/locate-next) commands
so that an out-of-view match automatically adjusts the
horizontal position bringing such data into view.  And
it provides for multiple successive same line matches.

Also, the basic 'more/less' navigation keys are active
in this new 'Inspect' window, to ease user transition.

There are no program changes required when entries are
added to or deleted from the rcfile.  And there are no
known limits to the complexity of a script, command or
pipeline, other than the unidirectional nature imposed
by the 'popen' function call which top cannot violate.

Since it's impossible to predict exactly what contents
will be generated, top treats all output as raw binary
data.  Any control characters display in '^C' notation
while all other unprintable characters show as '<AB>'.

The biggest problem encountered was with the find/next
capability since that strstr guy was really diminished
given the possibility that numerous 'strings' could be
encountered *within* many of top's raw, binary 'rows'.

Oh, and another problem was in maintaining the perfect
left & right text justification of this commit message
along with all of the commit summaries.  Some of those
summaries (like this very one) are of course, slightly
shorter, to make room for the 'man document' addition.

Enjoy!

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

top/top_nls.h

@@ -84,13 +84,20 @@ enum norm_nls {
 #ifndef WARN_CFG_OFF
    XTRA_warncfg_txt,
 #endif
+#ifndef INSP_OFFDEMO
+   YINSP_demo01_txt, YINSP_demo02_txt, YINSP_demo03_txt, YINSP_demo04_txt,
+   YINSP_demo05_txt,
+#endif
+   YINSP_failed_fmt, YINSP_noents_txt, YINSP_pidbad_fmt, YINSP_pidsee_fmt,
+   YINSP_rcfile_fmt, YINSP_status_fmt, YINSP_workin_txt,
       norm_MAX
 };
 
 enum uniq_nls {
    KEYS_helpbas_fmt, KEYS_helpext_fmt, WINDOWS_help_fmt, COLOR_custom_fmt,
    FIELD_header_fmt, MEMORY_lines_fmt, STATE_line_1_fmt, STATE_lin2x4_fmt,
-   STATE_lin2x5_fmt, STATE_lin2x6_fmt, STATE_lin2x7_fmt,
+   STATE_lin2x5_fmt, STATE_lin2x6_fmt, STATE_lin2x7_fmt, INSP_hdrbase_fmt,
+   INSP_hdrsels_fmt, INSP_hdrview_fmt,
       uniq_MAX
 };