Fix bugs about computing durations in the column view.

* org-colview.el (org-columns-string-to-number): When
computing the values for the colview, match durations and
convert them to HH:MM values.

* org.el (org-duration-string-to-minutes): Match non-round
numbers.  Add a new optional parameter to allow returning the
output as a string.

Thanks to Sébastien for reporting these bugs.

lisp/org-colview.el

@@ -1083,6 +1083,14 @@ Don't set this, this is meant for dynamic scoping.")
           (while l
             (setq sum (+ (string-to-number (pop l)) (/ sum 60))))
           sum))
+       ((string-match (concat "\\([0-9.]+\\) *\\("
+			      (regexp-opt (mapcar 'car org-effort-durations))
+			      "\\)") s)
+	(setq s (concat "0:" (org-duration-string-to-minutes s t)))
+        (let ((l (nreverse (org-split-string s ":"))) (sum 0.0))
+          (while l
+            (setq sum (+ (string-to-number (pop l)) (/ sum 60))))
+          sum))
        ((memq fmt '(checkbox checkbox-n-of-m checkbox-percent))
         (if (equal s "[X]") 1. 0.000001))
        ((memq fmt '(estimate)) (org-string-to-estimate s))

lisp/org.el

@@ -16368,7 +16368,7 @@ effort string \"2hours\" is equivalent to 120 minutes."
   :type '(alist :key-type (string :tag "Modifier")
 		:value-type (number :tag "Minutes")))
 
-(defun org-duration-string-to-minutes (s)
+(defun org-duration-string-to-minutes (s &optional output-to-string)
   "Convert a duration string S to minutes.
 
 A bare number is interpreted as minutes, modifiers can be set by
@@ -16377,15 +16377,16 @@ customizing `org-effort-durations' (which see).
 Entries containing a colon are interpreted as H:MM by
 `org-hh:mm-string-to-minutes'."
   (let ((result 0)
-	(re (concat "\\([0-9]+\\) *\\("
+	(re (concat "\\([0-9.]+\\) *\\("
 		    (regexp-opt (mapcar 'car org-effort-durations))
 		    "\\)")))
     (while (string-match re s)
       (incf result (* (cdr (assoc (match-string 2 s) org-effort-durations))
 		      (string-to-number (match-string 1 s))))
       (setq s (replace-match "" nil t s)))
+    (setq result (floor result))
     (incf result (org-hh:mm-string-to-minutes s))
-    result))
+    (if output-to-string (number-to-string result) result)))
 
 ;;;; Files