[fix bug 971632] Do not explicitly define bug component in event form.

When attaching a bug number to events, as Budget or Swag request, the
form relates it to a Bug objects in remozilla.

Because users often mix the Budget with the Swag field -and the other
way around-, the event form tries to find a Bug in remozilla using the
correct id and the wrong category, which will create a new Bug object
with these bogus data.

The fix is to lookup the bug using on the bug id, since Bugzilla
guaranties that the id is unique.
Add functional areas in load data section.
Merge pull request #632 from glogiotatidis/duplicate-remozilla-bugs

[fix bug  971632] Do not explicitly define bug component in event form.
Merge pull request #634 from akatsoulas/update-documentation

Add functional areas in load data section.