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.

2014/.year

@@ -1 +1,11 @@
-2014
+2014/birken
+2014/deak
+2014/endoh1
+2014/endoh2
+2014/maffiodo1
+2014/maffiodo2
+2014/morgan
+2014/sinon
+2014/skeggs
+2014/vik
+2014/wiedijk