Added Basic Auth, Cookies and arbitrary headers to ab.c/ab.8. Sorry

for the diff; ident seemed to have mangled some lines with the current
.indedent.pro. Sneaked in a write() to writev() replacement which
at least on FreeBSD makes a POST significantly 2-5% faster.

Added a README file. To make it even more obvious that there are
usefull things such as rotate_log, split_log and the likes.

PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83024 13f79535-47bb-0310-9956-ffa450edef68