Add possibility of running as scripts

By using the `#+' read syntax to determine if the file is being run as
a script or (presumably) compiled, we can use it as either a binary or
a script.

src/markam-convert.scm

@@ -24,6 +24,10 @@
 
 (declare (uses paths
                common))
+#+chicken-script
+(begin
+  (load "paths")
+  (load "common"))
 
 (require-extension sqlite3)
 (require-library srfi-4)

src/markam.scm

@@ -23,6 +23,10 @@
 
 (declare (uses paths
                common))
+#+chicken-script
+(begin
+  (load "paths")
+  (load "common"))
 
 (require-extension sqlite3)
 (require-library posix srfi-4)