Add preview of 1984-2019

The 2020 winners are hinted it, but the source code is not there,
nor are the hints. Someone could look into the HTML and
see what was commented out, but that is not a problem because
WHO won is known and the name of their AWARD is known already.
Moreover a number of the winners have talked about what their
entirs do, so the commented out spoiler text is not a bit problem.

One will find HTML commented out with:

    <!-- XXX remove when 2020 is ready
    2020 links here
    XXX remove when 2020 is ready -->

The "XXX remove when 2020 is ready" string is found at the
start and end comment blocks.  Again, soneone could read
what was commented out, but that is OK since most of that
information is known or can be known.  The following files
have such HTML comment blocks in them.

    ./winners.html
    ./years-spoiler.html
    ./years.html

In addition, ./all/summary.txt was modified to not
include the 2020 entries for the momemt.

The 2020 winner code AND write-ups are NOT part of this set.

p.s. The all/all.tar.bz2 does not contain the 2020 source code (yet?).

2005/jetro/Makefile

@@ -0,0 +1,18 @@
+
+INCDIR=`sdl-config --cflags`
+LDFLAGS+=`sdl-config --libs`
+
+build: jetro
+
+clean:
+	
+clobber:
+	-rm jetro
+
+jetro: jetro.c
+	sdl-config --version && ${CC} ${CFLAGS} ${INCDIR} ${LDFLAGS} $< -o $@
+
+alt:
+
+data:
+

2005/jetro/hint.text

@@ -0,0 +1,33 @@
+# Most sonorous output
+
+Jetro Lauha
+Talonpojantie 5A9,
+00790 Helsinki
+<http://jet.ro>
+
+## Judges' Comments
+
+We have seen entries with SDL graphics in the past, now it's time for SDL
+sound. This entry can even be run on a computer without a sound card with an
+appropriate setting of an environment variable - for that you'll have to dig
+into the SDL documentation.
+
+Can you figure out how the notes are encoded and program a different melody?
+
+### To build
+
+Download and install the portable [Simple DirectMedia Layer library](http://www.libsdl.org/)
+
+       cc -o jetro `sdl-config --cflags --libs` jetro.c
+
+### To run
+
+       ./jetro
+
+## Selected Author's Comments
+
+To compile the entry you need SDL library, which is used only for audio
+output. To run the entry make sure you have audio output available. The entry
+plays 22KHz 16 bit mono music with a small softsynth. When the music plays,
+you can stop the application by pressing enter, as the code will just wait
+with one call to getchar() before it quits.

2005/jetro/jetro.c

@@ -0,0 +1,47 @@
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include "SDL.h"
+
+#define X2(a) a a
+#define X4(a) a a a a
+#define S1(a,b,c) #a".."#b".."#c"."
+#define S14(a,b,c) X4(S1(a,b,c))
+#define S2(a) #a"."#a"....."
+#define S24(a) X4(S2(a))
+#define S4(a) #a#a#a#a
+#define S3(a,b,c) S1(a,b,c)S4(..)
+#define SE X4(X4(S4(..)))
+
+char l[]=SE SE X2(S3(J,H,M)S3(J,H,E)S3(F,E,A)S3(F,E,J)S3(H,E,O)S3(H,E,C)S3(H,F,
+x)S3(H,F,L)),b[]=SE X2(S4(j.jv.j.v)S4(f.fr.f.r)S4(e.eq.e.q)S4(h.ht.h.t))SE,*r[3
+]={S14(v,v,q)S14(r,r,m)S14(q,q,l)S14(t,t,o),S24(J)S24(F)S24(E)S24(H),S24(M)S24(
+J)S24(H)S24(L)};
+
+#define B int
+#define C double
+#define S static
+#define I(a,b,c,d,f,g) a=(f-d)/10.,b=1e-2*(d*(28-g)-f),c=1e-2*(d*f-8*g/3);\
+d+=a,f+=b,g+=c;
+S C T;typedef float A;S B D,R,U,p=0;S A F[5][0100000]={{0},{0}};
+
+void AA(void*u,Uint8*_,B L){u=u;while(L>0){B M=p&037777,s=p>>12,u=(s%R)[
+l],J=(s%U)[b],w=0,a=0,n;A v,q,m,E=(0x2000-(p&017777))/8192e0f;v=q=0;
+#define EF_(x) F[w][1638##x+M
+#define EF(l,s,ms) ((s*ms+EF_(4)-l]*(1-ms))/2.f+EF_(3)]/2.f)
+#define FQ(s) (A)sin((0.12*pow(2,n/12.))*p*s)
+#define IZ(v,c) v*=v c?v:0;
+#define BF F[w][M]=F[w][M+16384]=q;v+=q;++w
+#define IP(n,x,y,z,c) if(n!=46){x}q=EF(y,q,z);c;BF;
+#define IS(s,c) if(q c s 0.75f)q=s 0.75f;
+#define NQ(x,a,m) n=x-(x>=97?121:65)+a;q=FQ(m);
+IP(u,NQ(u,12,1)m=FQ(1.01f);IZ(q,>6e-1)IZ(m,>6e-1)q+=m;q*=5e-1f*(E+1);,12288,
+0.2f,;)for(;a<3;++a){char sn=(s%D)[a[r]];q=0;IP(sn,NQ(sn,12,0.25f)IZ(q,<0.3),
+12288,0.2f,;)}q=0;IP(J,NQ(J,0,1/8.f)X4(q*=q;)q=(A)fmod(q*20,4)*4;,6144,0.25f,IS
+(-,<)IS(+,>)q*=E)v*=0.6f;*(Sint16*)_=(Sint16)(v*32767);_++,++_,++p,--L,L--;}}
+
+B main(B c,char**a){SDL_AudioSpec f,d;c=c,a=a;D=strlen((!!c&24)[r]),R=strlen(l)
+,U=strlen(b);if(SDL_Init(16)<0)exit(1);atexit(SDL_Quit);f.freq=22050,f.format=\
+AUDIO_S16,f.channels=1,f.samples=4096,f.callback=AA,f.userdata=0;if(SDL_OpenAu\
+dio(&f,&d)<0)exit(2);T=0;SDL_PauseAudio(0);getchar();SDL_CloseAu\
+dio();return 0;}