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.

1994/dodsond1/README.md

@@ -12,7 +12,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./dodsond1

1994/dodsond2/README.md

@@ -12,7 +12,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./dodsond2

1994/horton/README.md

@@ -10,7 +10,7 @@ US\
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./horton A B C D

1994/imc/README.md

@@ -13,7 +13,7 @@ England
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./imc [NUMBER]

1994/ldb/README.md

@@ -12,7 +12,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./ldb < file

1994/schnitzi/README.md

@@ -15,7 +15,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./schnitzi < textfile

1994/shapiro/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./shapiro &

1994/smr/README.md

@@ -12,7 +12,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./smr

1994/tvr/README.md

@@ -12,7 +12,7 @@ Finland
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./tvr mode screensize/2 < colormapfile

1994/weisberg/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./weisberg

1994/westley/README.md

@@ -20,7 +20,7 @@ will get different error messages and one compiler line will make you win the
 game!
 
 
-## To run:
+## To use:
 
 There is no running as such. See below.