(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/country.t

@@ -0,0 +1,33 @@
+.TH Command COUNTRY
+.NA country "Find out country status"
+.LV Expert
+.SY "country <NATS>"
+The country command displays status of the countries you specify.
+.s1
+.EX country *
+.NF
+Sat Oct 15 20:54:30 2005
+  #   last access                         status     name
+  0   Now logged on                       DEITY      POGO
+  1   Now logged on                       Active     Khazad'ur
+  2   Unknown                             Active     Spectre
+  3   Unknown                             Sanctuary  3
+  4   Unknown                             Sanctuary  4
+  5   Unknown                             Visitor    visitor
+.FI
+.s1
+Deities get more information:
+.s1
+.EX country *
+.NF
+Sat Oct 15 20:54:30 2005
+  #   last access                         BTU  status     name
+  0   Now logged on                       640  DEITY      POGO
+  1   Now logged on			  480  Active     Khazad'ur
+  2  Sat Oct 15 17:56 - Sat Oct 15 18:11  638  Active     Spectre
+  3   Never logged on			  640  Sanctuary  3
+  4   Never logged on			  640  Sanctuary  4
+  5  Sat Oct 15 20:08 - ?                 640  Visitor    visitor
+.FI
+.s1
+.SA "players, Communication, Playing"