MFC r332671: top: fix warnings from clang/gcc

Add includes for <curses.h> and <termcap.h> where necessary, and
rename a few internal functions to have a "top_" prefix to avoid
clashes with standard names from curses.h/termcap.h headers.

Top now compiles without warnings on both gcc and clang.

MFC r315435:
Add ZFS compressed ARC stats to top(1)

MFC r316314:
top(1) read the wrong amount of data from sysctl

MFC r318448:
Explain the new fields in top(1) related to ZFS compressed ARC

Remove the laundry field during the merge, does not exist in stable/11

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Silence top(1) compiler warnings

The contrib/top code is no longer maintained upstream (last pulled 16 years
ago). The K&R-style followed by the code spews -Wimplicit-int and -Wreturn-type
warnings, amongst others. This silences 131 warnings with as little modification
as possible by adding necessary return types, definitions, headers, and header
guards, and missing header includes.

The 5 warnings that remain are due to undeclared ncurses references. I didn't
include curses.h and term.h because there are several local functions and macros
that conflict with those definitions.

MFC after: 3 weeks
Reviewed by: cem, ngie
Submitted by: Randy Westlund <rwestlun@gmail.com>
Differential Revision: https://reviews.freebsd.org/D6468

Add a new line to top that provides a brief summary of the ZFS ARC memory
usage on hosts using ZFS. The new line displays the total amount of RAM
used by the ARC along with the size of MFU, MRU, anonymous (in flight),
headers, and other (miscellaneous) sub-categories. The line is not
displayed on systems that are not using ZFS.

Reviewed by: avg, fs@
MFC after: 3 days

Rework the dynamic per-CPU stats code a bit. Always set 'statics->ncpus'
to the maximum number of CPUs to ensure that lcpustates[] array is always
allocated to the maximum size. Previously, if top was started without
per-CPU stats it would allocate a smaller lcpustates[] array. When
per-CPU stats were then enabled, it would overflow the array and trash
the cpustates_columns[] array causing the CPU stats to be printed in the
wrong locations.

Approved by: re (kib)
MFC after: 1 week

Allow per-CPU statistics to be toggled at runtime via the 'P' key.
While here, make -P a toggle similar to other options such as -I.

Reviewed by: arundel
MFC after: 1 week

Revert r214857 pursudant to 9.0-RELEASE cycle.

Requested by: jh

Output an appropriate amount of padding to line up per-CPU state columns
rather than using a terminal sequence to move the cursor when drawing the
initial screen.

Requested by: arundel
MFC after: 3 days

Inverse display of top(1)'s table header when running in inactive mode.

MFC after: 2 weeks

Since top displays the uptime including seconds, there is no need to add 30
onto it, which may have been used for rounding purposes in other utilities.

PR: bin/147934
Submitted by: Janne Snabb <snabb at epipe.com>
Approved by: rrs (mentor)
MFC after: 2 weeks

Explicitly line up the CPU state labels with the calculated starting column
that takes into account the width of the largest CPU ID. On systems with
> 10 CPUs the labels for the first 10 CPUs were not lined up properly
otherwise.

Approved by: re (kib)
MFC after: 1 week

Add a -P flag to display per-cpu cpu usage stats.

The 'text' argument of u_header() is not used, so we don't need to
trim_header() it.

Noticed by: bde

Properly trim the header line too, to fix wrap-around problems that
have been noticed by running top(1) in terminals that are too narrow
(or on systems with usernames that were too long, pushing everything
too far to the right).

Note that this does *not* solve the wrap-around problem of the system
statistics, which is an entirely different matter :-/

Tested on: i386, sparc64 (panther), amd64 (sledge)
Approved by: davidxu (in principle)

Fix a bug where you couldn't start top in a very small window. Now
you can start it in a small window, but it doesn't always display
anything sensible. Resizing the window does work though.

The patch is a slightly simpler one than Sheldon's in the PR.

PR: 21075

Resolve conflicts.

display.c: sprintf -> snprintf
top.c: fix from NetBSD/OpenBSD: make sure that new_message() is called
with a format.

Add $FreeBSD$ While I'm here.

These files are already off the vendor branch.

uptime display more in style with original code

Display uptime in upper right corner.

Submitted by: Andy Farkas <andyf@speednet.com.au>
Obtained from: freebsd-current list

Apply the FreeBSD-local patches.

Obtained from: The ports collection.

This commit was generated by cvs2svn to compensate for changes in r24139,
which included commits to RCS files with non-trunk default branches.

This is the long-awaited import of top into the base system (actually,
the src/contrib/top part right now). This tools is simply too system-
dependant to maintain it in the ports collection.