Bug 16754: Use validation plugin in budgets, planning, and contracts

Bug 16754: Use validation plugin in budgets, planning, and contracts

This patch removes the custom javascript form validation from three
templates: Budgets, budget planning, and contracts. Validation via the
validation plugin is done instead.

This patch also removes use of event attributes like onclick and
onchange. Also changed: I added the "Required" text next to required
fields as necessary.

To test, apply the patch and go to Administration -> Budgets.

- Test the budget creation process for adding, editing, and duplicating
  budgets. In all cases:
  - The start date and end date should be required
  - You should be warned if you enter an end date which falls before the
    start date.
  - The description should be required
  - The budget amount should be required to be a number

To test the budget planning page:

Note that much of the JS removed from this template was unused. It
looked for inputs by the name 'est_total' which don't exist.

- When viewing the table of funds for a budget, select a choice from the
  'planning' toolbar menu.
  - Verify that after entering a numeric value in any cell, the
    'remaning' value at the end of the row is correctly updated.
  - Verify that after entering non-numeric data an error is displayed.
  - Verify that clicking the 'auto-fill' button at the end of the row
    works to fill any empty or zero-value fields with the remaning funds
    available.

To test the vendor contracts page:

- Go to Acquisitions -> Vendor -> Contracts
- Add or edit a contract
  - Confirm that name, start date, and end date are required.
  - Confirm that you are warned if you enter an end date which falls
    before the start date.

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>