* stupidtable.js:

* jquery.tablesorter.js:
* jquery.tablesorter.min.js: now using "stupid table", that fixes the
  row additions and deletions

* ChooseADate.aspx: Page to choose a date between valid candidates

* YavscModel.csproj:
* FreeDate.cs: a free date

* FrontOfficeApiController.cs: cleanning using clauses

* FrontOfficeController.cs: - cleanning using clauses
- check user role before editing the model object

* GoogleController.cs: view "ChooseADate" in successfull response to
  "DateQuery"


* WorkFlowController.cs: check user's role to drop the estimate.

* Estimate.aspx: * now using "stupid table", that fixes the row
  additions and deletions.
* the user interface more intuitive at row deletion 

* DateQuery.aspx: changed the query parameters

* Web.csproj: google date + stupidtable - tablesorter

* IContentProvider.cs: cleaned an unused "using" clause

* WorkFlowManager.cs: cleanning spaces

web/Controllers/WorkFlowController.cs

@@ -70,6 +70,14 @@ namespace Yavsc.ApiControllers
 		[Authorize]
 		public void DropEstimate(long estid)
 		{
+			string username = Membership.GetUser().UserName;
+			Estimate e = wfmgr.GetEstimate (estid);
+			if (e == null)
+				throw new InvalidOperationException("not an estimate id:"+estid);
+			if (username != e.Responsible
+				&& !Roles.IsUserInRole ("FrontOffice"))
+				throw new UnauthorizedAccessException ("You're not allowed to drop this estimate");
+
 			wfmgr.DropEstimate (estid);
 		}