Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC r240470:
Remove scripts and tools which only functioned when src was using CVS

Approved by: cperciva (implicit)

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Update description of 'ac' subdirectory

describe localeck
plus some capitalization/whitespace fixes

Add short description of dumpvfscache

httpd-error is a shell script which print a summary about
Web files which does not exists on your host.

E.g.

httpd-error -userhits < /var/log/httpd-error.log

print the number of errors by users, sorted by error hits.

Add ac which check if the FreeBSD handbook is in sync with the committers list

README reads:
This directory is for diagnostic programs.

A diagnostic program is one that will inform you that something is wrong
somewhere, for instance by traversing a kernel-structure and verifying
the integrity.

Please make a subdir per program, and add a brief description to this file.