Update the filname column width-sizing piece of mod_autoindex
	so that it's customisable with a NameLength keyword on the
	IndexOptions directive.  A value of '*' means 'as wide as the
	longest filename,' which was the default effect of the last
	patch in this area.

PR:	1949, 2324


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@81979 13f79535-47bb-0310-9956-ffa450edef68