[PE-D] Deadline with the same title cannot be added.

[nus-pe-bot]

Steps to recreate:

1. Add a deadline task with the following input:
   deadline title: Tutorial 1 desc: finish up tutorial 1 for CS1234 datetime: 01-01-0001 10:00 tag: CS1234

2. Add another deadline task with the same name, but different module code:
   deadline title: Tutorial 1 desc: finish up tutorial 1 for CS2345 datetime: 01-01-0001 10:00 tag: CS2345

Expected:
Both task to be added even though they have the same title. This is because it is possible to have both different tutorial 1 from different modules.

Actual:

Also, you may want to take note that the year of 0001 can be added. I'm not sure if this is intended.

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Labels: severity.Low type.FeatureFlaw
original: yongmingyang/ped#4