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.

1991/ant/README.md

@@ -12,7 +12,7 @@ Canada, N2J 2W9			Canada, N2L 6G9
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./ant some_file

1991/buzzard/README.md

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

1991/cdupont/README.md

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

1991/davidguy/README.md

@@ -20,7 +20,7 @@ US
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./davidguy ip_address:server.screen

1991/dds/README.md

@@ -12,7 +12,7 @@ Mastodon: <https://mstdn.social/@DSpinellis>
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 ./dds basic_program 2>/dev/null

1991/fine/README.md

@@ -10,7 +10,7 @@ US\
 make all
 ```
 
-## To run:
+## To use:
 
 ```sh
 echo text | ./fine

1991/rince/README.md

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

1991/westley/README.md

@@ -14,7 +14,7 @@ US\
 make all
 ```
 
-## To run:
+## To use:
 
 Make and run as follows: