Change 'To run' to 'To use' in all README.md files

As in:

    sgit -e 's/# To run/# To use/g' '*README.md'

This makes consistent the message for how to use the program. 'How to
use' was chosen because one can run a program just by doing './foo' but
that doesn't imply that's how to use it but the purpose of the section
is how to use it.

2004/anonymous/README.md

@@ -10,7 +10,7 @@ Singapore\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./anonymous

2004/arachnid/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./arachnid [mazefile]

2004/burley/README.md

@@ -11,7 +11,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./burley

2004/gavare/README.md

@@ -10,7 +10,7 @@ Sweden\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./gavare

2004/gavin/README.md

@@ -11,7 +11,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./gavin

2004/hibachi/README.md

@@ -10,7 +10,7 @@ Canada\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 cd build; ./hibachi-start.sh &

2004/hoyle/README.md

@@ -10,7 +10,7 @@ US\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./hoyle point ...

2004/jdalbec/README.md

@@ -10,7 +10,7 @@ US\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./jdalbec number ...

2004/kopczynski/README.md

@@ -12,7 +12,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./kopczynski < input_file

2004/newbern/README.md

@@ -11,7 +11,7 @@ make
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./newbern [file.dat arg]

2004/omoikane/README.md

@@ -10,7 +10,7 @@ US\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./omoikane infile layout outfile

2004/schnitzi/README.md

@@ -10,7 +10,7 @@ Australia\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./schnitzi

2004/sds/README.md

@@ -10,7 +10,7 @@ Finland\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./sds

2004/vik1/README.md

@@ -12,7 +12,7 @@ US\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./vik1 [arg]

2004/vik2/README.md

@@ -11,7 +11,7 @@ US\
 make
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./vik2