(info, html): Implement.

(all): Depend on info.

Flatten info directory.  This undoes the move to one subdirectory per
chapter, which was done during Empire 2.  The structure doesn't buy us
much, as the info name space is flat, and it complicates makefiles.

Overhaul info.pl:
- It now wants to run in the root of the build tree.
- Information on source files and subjects is now stored in makefiles,
  thus info.pl no longer picks up random junk from the file system.
- Clean up Perl anachronisms, in particular use subroutine arguments and
  results rather than global variables where convenient.
- Change format of diagnostics to the common format used by GNU tools,
  so that Emacs and the like can parse it.
- Catch missing .SA.
- When creating a new subject file, cowardly refuse to overwrite an
  existing file.
- Subject files contain topics sorted by chapter, then by name.  The
  order of chapters used to depend on how Perl sorts hash keys.  Fix
  it.

info/deliver.t

@@ -0,0 +1,54 @@
+.TH Command DELIVER
+.NA deliver "Establish delivery routes for shells, ore, etc"
+.LV Expert
+.SY "deliver <COMM> <SECTS> <THRESH> <DIR>"
+.SY "deliver <COMM> <SECTS> +<THRESH>"
+.SY "deliver <COMM> <SECTS> <DIR>"
+.SY "deliver <COMM> <SECTS> q"
+.s1
+An example of using deliver in addition to distribute is where
+you may have a mine which uses distribute to get its food
+from a warehouse, but uses deliver to export its iron to the adjacent
+hcm factory.
+.s1
+Deliver may be used to extra-fine tune a distribution network.  In
+fact, deliver can greatly improve the performance of a distribution
+network if used properly.
+.s1
+If 'q' is specified rather than a threshold, then the delivery
+directions and thresholds will simply be listed.  You can also use the
+"cutoff" command to list delivery thresholds.
+.s1
+The number <THRESH> specifies how much of that commodity you would
+like to be kept in the sector.  If you do not want to change the
+direction that a sector delivers to, then put a '+' before the number
+<THRESH>.
+.s1
+Note that delivery thresholds are stored as multiples of 8.  If you
+specify a threshold that is not a multiple of 8, it will be rounded down.
+.s1
+The direction must be specified as one of the six direction characters,
+(usually `y' `u' `j' `n' `b' or `g'), the \*Qno-direction\*U character,
+(usually `h').  If no direction is specified, then the direction will
+not be changed for that sector.
+.s1
+.EX "deli f 0,0 0 j"
+Will deliver all food from 0,0 to 2,0.
+.EX "deli i * ?des=m +87"
+Will set iron delivery threshold to 80 in all mines.
+.EX "deli l * q"
+Will list all lcm delivery specifications.  (Sectors with no delivery
+threshold or direction will not be listed).
+.s1
+The census and commodity reports will indicate deliveries by the 
+same characters used to specify them in this command.
+.s1
+If, during an update, the destination sector is not owned by you,
+the message \*Qdelivery walkout between x,y & x,y\*U will be printed
+and nothing will be delivered.
+.s1
+Delivery routes may also be mapped out with the \*Qroute\*U command.
+.s1
+See "info Mobility" for an explanation of mobility costs.
+.s1
+.SA "cutoff, census, commodity, route, distribute, Distribution"