add make genpath rules, .path files, updated .top and .year

Add .path files to each winner directory: a file containing
the path to the winner directory from the top directory.

Changed YYYY/.year files to contain the paths, from the top
directory, if the winning directories for the given year.

Changed `/.top` to contain the IOCCC years.

Added `make genpath` rule to the top Makefile and the
year Makefiles to generate the above.

Added FAQ 6.8 to `faq.md` to explain the above.

Updated manifest to reflect recent changes to the list of files.

tmp/path_list.required.txt

@@ -924,6 +924,7 @@
 2000/dlowe/README.md
 2000/dlowe/dlowe.c
 2000/dlowe/dlowe.orig.c
+2000/dlowe/try.sh
 2000/jarijyrki/.gitignore
 2000/jarijyrki/Makefile
 2000/jarijyrki/README.md
@@ -1005,6 +1006,7 @@
 2001/ctk/.gitignore
 2001/ctk/Makefile
 2001/ctk/README.md
+2001/ctk/ctk.alt.c
 2001/ctk/ctk.c
 2001/ctk/ctk.orig.c
 2001/dgbeards/.gitignore
@@ -2497,6 +2499,7 @@
 2015/duble/prog.alt.c
 2015/duble/prog.c
 2015/duble/prog.orig.c
+2015/duble/try.sh
 2015/endoh1/.gitignore
 2015/endoh1/Makefile
 2015/endoh1/README.md
@@ -2528,10 +2531,12 @@
 2015/hou/README.md
 2015/hou/prog.c
 2015/hou/prog.orig.c
+2015/hou/rfc1321.txt
 2015/howe/.gitignore
 2015/howe/Makefile
 2015/howe/README.md
 2015/howe/avgtime.sh
+2015/howe/cc.1
 2015/howe/makeholes.c
 2015/howe/prog-test.sh
 2015/howe/prog.alt.c
@@ -2540,11 +2545,14 @@
 2015/howe/spoiler/Makefile
 2015/howe/spoiler/err.h
 2015/howe/spoiler/prog.c
+2015/howe/try.sh
+2015/howe/war-and-peace.txt
 2015/mills1/.gitignore
 2015/mills1/Makefile
 2015/mills1/README.md
 2015/mills1/prog.c
 2015/mills1/prog.orig.c
+2015/mills1/try.sh
 2015/mills2/.gitignore
 2015/mills2/Makefile
 2015/mills2/README.md
@@ -2552,6 +2560,7 @@
 2015/mills2/ioccc_rules.txt.Z
 2015/mills2/prog.c
 2015/mills2/prog.orig.c
+2015/mills2/try.sh
 2015/muth/.gitignore
 2015/muth/Makefile
 2015/muth/README.md
@@ -2572,6 +2581,7 @@
 2015/muth/tape_77_55.h
 2015/muth/tape_empty.h
 2015/muth/tape_five.h
+2015/muth/try.sh
 2015/schweikhardt/.gitignore
 2015/schweikhardt/Makefile
 2015/schweikhardt/README.md
@@ -2583,6 +2593,7 @@
 2015/yang/prog.c
 2015/yang/prog.orig.c
 2015/yang/spoiler.html
+2015/yang/try.sh
 2018/algmyr/.gitignore
 2018/algmyr/Makefile
 2018/algmyr/README.md
@@ -2863,7 +2874,6 @@
 2019/poikola/.gitignore
 2019/poikola/Makefile
 2019/poikola/README.md
-2019/poikola/poikola.pdf
 2019/poikola/poikola.tex
 2019/poikola/prog.c
 2019/poikola/prog.orig.c