Remove get_server_field from leave_application

- Make get_holidays and get_total_leave_days global to module
- Replace get_server_field with using whitelisted function
get_total_leave_days
diff --git a/erpnext/hr/doctype/leave_application/leave_application.js b/erpnext/hr/doctype/leave_application/leave_application.js
index 0d8b37e..ecaac4a 100755
--- a/erpnext/hr/doctype/leave_application/leave_application.js
+++ b/erpnext/hr/doctype/leave_application/leave_application.js
@@ -104,7 +104,15 @@
 		if(cint(doc.half_day) == 1) set_multiple(dt,dn,{total_leave_days:0.5});
 		else{
 			// server call is done to include holidays in leave days calculations
-			return get_server_fields('get_total_leave_days', '', '', doc, dt, dn, 1);
+			return frappe.call({
+				method: 'erpnext.hr.doctype.leave_application.leave_application.get_total_leave_days',
+				args: {leave_app: doc},
+				callback: function(response) {
+					if (response && response.message) {
+						cur_frm.set_value('total_leave_days', response.message.total_leave_days);
+					}
+				}
+			});
 		}
 	}
 }
diff --git a/erpnext/hr/doctype/leave_application/leave_application.py b/erpnext/hr/doctype/leave_application/leave_application.py
index 1751eb1..50d1d6f 100755
--- a/erpnext/hr/doctype/leave_application/leave_application.py
+++ b/erpnext/hr/doctype/leave_application/leave_application.py
@@ -2,7 +2,7 @@
 # License: GNU General Public License v3. See license.txt
 
 from __future__ import unicode_literals
-import frappe
+import frappe, json
 from frappe import _
 
 from frappe.utils import cint, cstr, date_diff, flt, formatdate, getdate, get_url_to_form, \
@@ -77,26 +77,10 @@
 					LeaveDayBlockedError)
 
 	def get_holidays(self):
-		tot_hol = frappe.db.sql("""select count(*) from `tabHoliday` h1, `tabHoliday List` h2, `tabEmployee` e1
-			where e1.name = %s and h1.parent = h2.name and e1.holiday_list = h2.name
-			and h1.holiday_date between %s and %s""", (self.employee, self.from_date, self.to_date))
-		if not tot_hol:
-			tot_hol = frappe.db.sql("""select count(*) from `tabHoliday` h1, `tabHoliday List` h2
-				where h1.parent = h2.name and h1.holiday_date between %s and %s
-				and ifnull(h2.is_default,0) = 1 and h2.fiscal_year = %s""",
-				(self.from_date, self.to_date, self.fiscal_year))
-		return tot_hol and flt(tot_hol[0][0]) or 0
+		return get_holidays(self)
 
 	def get_total_leave_days(self):
-		"""Calculates total leave days based on input and holidays"""
-		ret = {'total_leave_days' : 0.5}
-		if not self.half_day:
-			tot_days = date_diff(self.to_date, self.from_date) + 1
-			holidays = self.get_holidays()
-			ret = {
-				'total_leave_days' : flt(tot_days)-flt(holidays)
-			}
-		return ret
+		return get_total_leave_days(self)
 
 	def validate_to_date(self):
 		if self.from_date and self.to_date and \
@@ -216,6 +200,33 @@
 		post(**{"txt": args.message, "contact": args.message_to, "subject": args.subject,
 			"notify": cint(self.follow_via_email)})
 
+def get_holidays(leave_app):
+	tot_hol = frappe.db.sql("""select count(*) from `tabHoliday` h1, `tabHoliday List` h2, `tabEmployee` e1
+		where e1.name = %s and h1.parent = h2.name and e1.holiday_list = h2.name
+		and h1.holiday_date between %s and %s""", (leave_app.employee, leave_app.from_date, leave_app.to_date))
+	if not tot_hol:
+		tot_hol = frappe.db.sql("""select count(*) from `tabHoliday` h1, `tabHoliday List` h2
+			where h1.parent = h2.name and h1.holiday_date between %s and %s
+			and ifnull(h2.is_default,0) = 1 and h2.fiscal_year = %s""",
+			(leave_app.from_date, leave_app.to_date, leave_app.fiscal_year))
+	return tot_hol and flt(tot_hol[0][0]) or 0
+
+@frappe.whitelist()
+def get_total_leave_days(leave_app):
+	# Parse Leave Application if neccessary
+	if isinstance(leave_app, str) or isinstance(leave_app, unicode):
+		leave_app = frappe.get_doc(json.loads(leave_app))
+
+	"""Calculates total leave days based on input and holidays"""
+	ret = {'total_leave_days' : 0.5}
+	if not leave_app.half_day:
+		tot_days = date_diff(leave_app.to_date, leave_app.from_date) + 1
+		holidays = leave_app.get_holidays()
+		ret = {
+			'total_leave_days' : flt(tot_days)-flt(holidays)
+		}
+	return ret
+
 @frappe.whitelist()
 def get_leave_balance(employee, leave_type, fiscal_year):
 	leave_all = frappe.db.sql("""select total_leaves_allocated