(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/newspaper.t

@@ -0,0 +1,103 @@
+.TH Command NEWSPAPER
+.NA newspaper "The yellow press"
+.LV Basic
+.SY "newspaper <DAYS>"
+The news command prints a copy of the local newspaper published by
+The Empire News.
+.s1
+This \*Qmorning after\*U daily recounts financial exploits,
+the telegram traffic between countries,
+and political maneuvering
+in addition to the chronicling of such mundanities as shelling,
+attacking, and nuclear testing.
+.s1
+It's great breakfast reading!
+.s1
+Normally your edition of the news will only contain events that have
+occurred since you last read the news.
+You can specify what time period you'd like it to cover
+with the optional <DAYS> argument in the command line as in:
+.s1
+.EX news 2
+Which will print the news for the last two days.
+.s1
+You can select whose news to see with the ?actor or ?victim selectors,
+and what news to see with the ?action selector.  Actions are:
+.nf
+     1)  Successful sector attack       
+     2)  Unsuccessful attack            
+     3)  Spy shot                       
+     4)  Telegram sent                  
+     5)  Treaty signing                 
+     6)  Loan made                      
+     7)  Loan repaid                    
+     8)  Goods sold                     
+     9)  Airspace violated              
+     10) Artillery fire on sectors      
+     11) Artillery fire on ships        
+     12) Attacking unowned land         
+     13) Ship torpedoed                 
+     14) Gunners firing in self-defense 
+     15) Breaking sanctuary             
+     16) Planes bombing sectors         
+     17) Planes bombing ships           
+     18) Successful boarding actions    
+     19) Unsuccessful boarding actions  
+     21) Collecting on loans            
+     22) Considering treaty violation   
+     23) Actual treaty violation        
+     25) Ships hitting mines            
+     26) Alliance declaration	          
+     28) War declarations               
+     29) Alliance dissolving
+     30) War ending
+     31) Plague outbreaks
+     32) Plague deaths
+     33) Name changes
+     34) Starvation
+     36) Air to air combat
+     37) Nukes going off
+     38) Terrorists
+     39) Shooting civs & uw's
+     40) Satellite launches
+     41) ASAT attacks
+     42) Deity giving things
+     43) Deity aids country
+     44) Deity hurts country
+     45) Deity taking things
+     46) ABM interceptions
+     47) Missile firing on sectors
+     48) Missile firing on ships
+     49) Trade between countries
+     50) Pirates fence loot
+     51) Pirates keep loot
+     52) Ship torps ship
+     53) Sub bombed by ASW plane
+     55) Unit bombed
+     56) Unit hits land mine
+     57) Fortress artillery supports attack
+     58) Land unit artillery supports attack
+     59) Naval artillery supports attack
+     60) Capital sacking
+     61) Upgrades relations to friendly
+     62) Downgrades relations to friendly
+     63) Upgrades relations to neutral
+     64) Downgrades relations to friendly
+     65) Upgrades relations to hostile
+     66) Downgrades relations to friendly
+     67) Missile hits sector
+     68) Missile hits ship
+     69) Settles on a new island
+     70) ABM interception
+     71) Missile hits units
+     72) Sub-launched missile hits units
+     73) Successful assault
+     74) Successful paradrop
+     75) Paradrop into unoccuppied land
+     76) Failed assault
+     77) Failed paradrop
+     80) Failed boarding of a land unit
+     81) Successful boarding of a land unit
+.fi
+.s1
+.SA "headlines, Communication"