[Spambayes] Add button to show raw mail message (copy of feature request #886 903)

[Katz, Amir]

This is regarding the Outlook plug-in (binary version). In a competing
product, Spammunition (also free), there is a button
called 'show analysis', which shows the statistics, like SpamBayes' 'show
spam clues for current message'.

However, Spammunition's feature is better because:
a) It does not create a new mail message that has to be
manually discarded
b) It opens a pop up window with the three sections:
- the mail headers
- the raw message
- the Bayesian statistics

Another issue: in the created Outlook mail message, there is an attachment
which is the original mail. If I open it, is it identical to opening the
original mail (which may contain harmful attachments and other bad stuff) ?

AJK 

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