Added calls to im_biz_object_delete_timephased_data in order to delete
  timephased data when modifying a task

  Added code to delete im_gantt_assignments

  Added schedule_constraint_id field to tasks

  Start- and end date are now formatted as dates instead of TZ

  Fixed delete audit action

  https://sourceforge.net/projects/project-open/forums/forum/295937/topic/5217586

-- mouse over shows entire task name

-- improvements layout

  Thanks Malte!

  Updated to OpenACS 5.7

  Added JS calendar widget

  Fixed issue for users without permissions to update
  planned_ and billable_units

  - Eliminated "duplicate task warning"
  - Eliminated "timephase data warning"
  - Fixed "small assignment differences" issue

  Now showing dependency type and lag time

  Fixed entry

  Now rounding planned_units and billable units in display

  Fixed nuking operation on timesheet tasks by
  renaming the audit action from "delete" to "before_nuke"

  Fixed issue creating a new task

  - Moved the select checkboxes to the left
  - Fixed issue deleting tasks

  Added a column to show the list of assigned users to the task

  - Fixed parameters eliminating task type restriction

  Working on effort_driven_type

-- fixed problem with joining where clauses (missing space)

   moved restrict_to_project from criteria to where-clause

-- If restrict_to_project_id = 0 all records need to be shown, added check to where-clause and removed fix "where statement"

  Now catching the error in the timesheet page
  and returning an appropriate error

  Now calculating the planned and billable hours
  as sums of the tasks below a sub-project

  Fixed 1st part of subtotal of hours