Make the estimate in list editable

Signed-off-by: tianyuli <tli@wpi.edu>
Make the edited estimate can be shown on list view

Signed-off-by: tianyuli <tli@wpi.edu>
Ensure that the requirement can not be edited when it is INPROGRESS or COMPLETE

Signed-off-by: tianyuli <tli@wpi.edu>
Basically done version. I will be workong on GUI..

Signed-off-by: tianyuli <tli@wpi.edu>
Final version.

Signed-off-by: tianyuli <tli@wpi.edu>
Merge remote-tracking branch 'origin/team1-edit-list' into team1-dev

Conflicts:
	RequirementsManager/src/edu/wpi/cs/wpisuitetng/modules/RequirementsManager/tabs/model/RequirementTableModel.java
Revised

Signed-off-by: tianyuli <tli@wpi.edu>
The changes just are for chanignt he conditional for the pop up window
Merge remote-tracking branch 'origin/team1-edit-list' into team1-dev