Refactor and improve specific modules documentation.

doc/specification.md

@@ -2,7 +2,8 @@ Organization Specification
 ==========================
 
 The specification of how the organization handles membership fees is
-completely wrapped inside the specification module.
+completely wrapped inside the specification module. Some other
+organization-specific modules are also included here.
 
 Modules
 -------
@@ -29,3 +30,52 @@ A period lookup-table for CZK/EUR conversion. Used by the
 
 Determines how many months the member can be suspended before any
 action is required.
+
+### Primes
+
+    (import primes)
+
+A very simple module for generating and checking 4-digit prime numbers.
+
+    (is-4digit-prime? n)
+
+* ```n``` - a number
+
+Returns true if the given number ```n``` has four digits and it is a
+prime number.
+
+    (gen-all-4digit-primes)
+
+Returns a list of all 4-digit prime numbers.
+
+### Configuration
+
+    (import configuration)
+
+The exact behavior of some algorithms in other modules can be changed
+via configuration parameters in this global configuration module.
+
+This module also handles configuration file loading.
+
+    (*etc-hackerbase* path)
+
+* ```path``` - path to file with configuration
+
+Used by ```load-configuration!``` to load the system-specific default
+configuration values.
+  
+*members-directory*
+
+*apikeys-file*
+
+*jendasap-checked*
+
+*bank-dir*
+
+*email-from*
+
+*summary-mailto*
+  
+    (load-configuration!)
+
+Loads configuration from ```(*etc-hackerbase*)``` file.