Avoid "Fiji won't quit" problem when Bug dialog is shown

We must never execute dispose() outside of the event dispatch thread...

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Help Fiji users craft good bug reports

When scientists encounter a bug in Fiji and then hit Help>Report a Bug,
they are usually too stressed out to take a step back to reflect and
realize that they now should spend as much effort into crafting an
excellent bug report as they wish volunteers would spend to help them.
The result is typically a bug report lacking pretty much all of the
relevant information, not least of all an easy way to reproduce the issue.

Let's help them with that: scientists are not stupid per se, after all,
they do understand when one explains that developers are as busy as they
are, and that those developers who try to help are actually the good guys,
and deserve to be given as easy a time while they are helping.

So let's give them a very brief description what makes a good bug report
and offer a link to the Wiki page about bug reporting (the color of the
link is also designed to draw their attention to the text which they might
otherwise ignore happily).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge pull request #3 from fiji/help-reporters

Help bug reporters write kick-ass bug reports