Simple time tracking functionality added. Time can be logged at issue or project level.

There's no aggregation reports for now, it's just possible to see all time entries for a project or an issue.
A new "activities" enumeration is added.
Permission for a role to log time must be set (new "Time tracking" section in role permissions screen).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@368 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/stylesheets/application.css

@@ -155,6 +155,7 @@ vertical-align: middle;
 .icon-index  { background-image: url(../images/index.png); }
 .icon-history  { background-image: url(../images/history.png); }
 .icon-feed  { background-image: url(../images/feed.png); }
+.icon-time  { background-image: url(../images/time.png); }
 
 .icon22-projects { background-image: url(../images/22x22/projects.png); }
 .icon22-users { background-image: url(../images/22x22/users.png); }
@@ -542,7 +543,7 @@ font-size: 1em;
 /***** Tooltips ******/
 .tooltip{position:relative;z-index:24;}
 .tooltip:hover{z-index:25;color:#000;}
-.tooltip span.tip{display: none}
+.tooltip span.tip{display: none; text-align:left;}
 
 div.tooltip:hover span.tip{
 display:block;