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.

1990/baruch/README.md

@@ -14,7 +14,7 @@ make all
 
 There is [alternate code](#alternate-code) for those using Turbo-C or MSC.
 
-## To run:
+## To use:
 
 ```sh
 echo 4 | ./baruch

1990/cmills/README.md

@@ -9,7 +9,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./cmills [starting_cash]

1990/dds/README.md

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

1990/dg/README.md

@@ -13,7 +13,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 echo foo bar | ./dg

1990/pjr/README.md

@@ -14,7 +14,7 @@ England, U.K.
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./pjr

1990/scjones/README.md

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

1990/stig/README.md

@@ -11,7 +11,7 @@ Norway
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 make all

1990/tbr/README.md

@@ -13,7 +13,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./tbr

1990/theorem/README.md

@@ -14,7 +14,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./theorem expression x1 x2 h y1

1990/westley/README.md

@@ -15,7 +15,7 @@ make all
 ```
 
 
-## To run:
+## To use:
 
 ```sh
 ./westley number