Cleanup the command line options: `-?' was documented to show the usage list

but does it with an error because `?' is not a valid command. OTOH a lot of
users expect `-h' to print such a usage list and instead are annoyed for ages
by our huge unreadable list of directives.  So we now changed the command line
options this way:

 1. `-L' => `-R'
    Intent: we need `-L' to be free, and `-R' for the DSO run-time path is
    very similar to the popular linker option.

 2. `-h' => `-L'
    Intent: while -l gives the small list of modules, -L now gives the
    large list of directives implemented by these modules.  This is also
    consistent with -v (short version info) and -V (large version info).

 3. `-?' => `-h'
    Intent: it's now the expected option ;-)

The manual page was adjusted accordingly.

Submitted by: Ralf S. Engelschall
Reviewed by: Randy Terbush
PR: 2714


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82497 13f79535-47bb-0310-9956-ffa450edef68