fixed bug #7 regarding ind cost

updated the following files:
-individualController.groovy
-FeedsInventory.groovy
-MedicineInventory.groovy
-feedsInventory/_form.gsp
-individualCost/_form.gsp
-individualCost/_feedsCharge.gsp
-individualCost/_medCharge.gsp
-medicineInvenotry/_form.gsp
-update.js