Fix tmp/format-headers.sh, format headers

The script had "s surrounding the git ls-files command which turned it
to a single file which of course is wrong.

Ran script again fixing many README.md files that had incorrect number
of blank lines for critical headers.

This will have to be done a final but a good number of files have been
corrected.

2013/birken/README.md

@@ -10,7 +10,6 @@ see the [original code](#original-code) section.
 
 ## To use:
 
-
 ```sh
 ./birken.alt < 17_columns_wide_paint_by_numbers_file
 ```
@@ -65,7 +64,6 @@ hard to see the art of the entry but you may do so if you wish.
 
 ### Original build:
 
-
 ```sh
 make all
 ```

2013/cable2/README.md

@@ -16,8 +16,6 @@ STATUS: INABIAF - please **DO NOT** fix
 For more detailed information see [2013 cable2 in bugs.md](/bugs.md#2013-cable2).
 
 
-
-
 ## To use:
 
 ```sh

2013/cable3/README.md

@@ -78,7 +78,6 @@ Update: This entry now has its own website:
 
 ## Author's remarks:
 
-
 ### A tiny but highly functional PC emulator/virtual machine
 
 The author hereby presents, for the delectation (?) of the judges, a portable PC

2013/endoh1/README.md

@@ -4,6 +4,7 @@
 make
 ```
 
+
 ### Bugs and (Mis)features:
 
 The current status of this entry is:

2013/endoh2/README.md

@@ -32,7 +32,6 @@ Next look at `jpeg.jpg` in an image viewer program.
 
 ## Judges' remarks:
 
-
 This is a program which, when fed its own source, generates a program that
 almost is its whitespace inverse, which, in its order, generates a JPEG file
 (speaking of file size abuse, that is about 16.4 times larger than a PBM file

2013/endoh3/README.md

@@ -4,6 +4,7 @@
 make
 ```
 
+
 ### Bugs and (Mis)features:
 
 The current status of this entry is: