Mass fixes to headers in README.md files

There were many many README.md files with the wrong heading level for
different sections. These have been changed.

To help go through the changes it should be noted I used sgit and also
here is what is changed:

The 'Try', 'To build' and 'To run' lines have two '#'s. Some had one and
others had three.

An exception is that in 1984/anonymous/README.md for the alternative
code that had three '#'s. This is not consistent yet and it might be
that only two are desired. But for now that one at least has three.

1989/fubar/README.md

@@ -15,11 +15,11 @@
 modern systems. Thank you Cody for your assistance!
 
 
-### To run
+## To run
 
 	./fubar number>
 
-### Try:
+## Try:
 
 	./fubar 2
 

1989/jar.1/README.md

@@ -7,7 +7,7 @@
 	02150 Espoo
 	Finland
 
-# To build and run:
+## To build and run:
 
     make clobber all
 

1989/jar.2/README.md

@@ -23,7 +23,7 @@ modern compilers. Modern compilers do not allow code like:
 Thank you Cody for your assistance!
 
 
-### To run:
+## To run:
 
 
 	./jar.2