justification, use auto, range for, etc.

src/common/rclconfig.cpp

@@ -799,7 +799,7 @@ bool RclConfig::getMimeCategories(vector<string>& cats) const
     return true;
 }
 
-bool RclConfig::isMimeCategory(string& cat) const
+bool RclConfig::isMimeCategory(const string& cat) const
 {
     vector<string>cats;
     getMimeCategories(cats);

src/common/rclconfig.h

@@ -274,7 +274,7 @@ public:
     /** mimeconf: get list of file categories */
     bool getMimeCategories(vector<string>&) const;
     /** mimeconf: is parameter one of the categories ? */
-    bool isMimeCategory(string&) const;
+    bool isMimeCategory(const string&) const;
     /** mimeconf: get list of mime types for category */
     bool getMimeCatTypes(const string& cat, vector<string>&) const;