This series of patches hopes to clean up the server code.  Right now it's
a mish-mash of commands and no clear organization or arrangement.  Fx,
code to directly toggle the AI status of players is in stdinhand.c.  This 
series of patches divides stdinhand.c into several files based on 
functionality.  The first few patches are huge rearrangements of chunks of 
code, while later (and future) one will target particular sections for 
readability and maitainability.

NOTE: Apply patches in order.  To compile you must run automake, etc, etc.

Server-Cleanup-1
================
- Creates files commands.[ch] and serverio.[ch].
- Updates server/Makefile.am to include new files.
- Removes command enumeration and descriptions from stdinhand.c and puts 
    them into command.[ch]
- Removes cmd_reply* functions from stdinhand.c and puts them into 
    serverio.[ch].

Server-Cleanup-2
================
- Creates files settings.[ch].
- Updates server/Makefile.am to include new files.
- Removes setting definitions and support functions from stdinhand.c and 
    puts them into settings.[ch].
- It was necessary to change SETTINGS_NUM to a 'const int' because it was 
    needed in other files but we can't #define it in settings.h.

Server-Cleanup-3
================
- It gets kind of ugly here.  Sorry, Raimar, it had to happen sometime. :)
- The command struct has been expanded to include a callback function.
- In this revision, functions that are actually referenced in the command
    struct are defined in .h files, whereas "helper" functions are 
    declared as static.
- In commands.c, add static callback helper functions and a few basic
    callbacks in the commands[] struct array.  Ones that do not have
    functions associated with them are set to be NULL right now.
- Tore more code out of stdinhand.c and put it into commands.c.  The 
    downside (?) of this is that many of these functions are no longer 
    static and confined to one file.  Since the parsing code isn't really 
    supposed to be high-performance (not called that often) it's not a 
    huge loss.
- Changed definition of quit_game to match the callback; subsequently 
    changed how it's invoked from sernet.c.
- Removed many option-related functions from stdinhand.c and gave them the 
    same treatment as the commands WRT static/non-static as necessary.
- At this point there are a few things (fx, horiz_line) that are defined 
    as static in two files because they're needed by relatively (ATM) 
    immutable functions in both files.  These will go away soon.

Server-Cleanup-4
================
- Most of this is (still) rearrangement, some of it is temporary so I can 
    get the code flushed out into its final position.
- Moved all the metaserver stuff into commands.[ch].
- Moved some basic option parsing into commands.[ch].
- Updates the commands[] array with more functions.
- Some entries in the commands[] array didn't have a long explanation 
    string, so I simply copied the short one in order to make a spot for 
    the function pointer.
- Moved quit/save/load, etc, etc functions into commands.[ch].
- Still working on how to get the AI command stuff to fit in nicely, as 
    well as the access level control code.
- Added commands.h to srv_main.c (for show_players function).