Extend available methods about bvar HOT 4 CLOSED

predict, irf, fitted, residuals and fevd have been implemented as of 92286d2.

This includes methods for different objects that make sense in this context. Beside calculating stuff ex-post the main functionality is calculation of quantiles and improved printing, etc.

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• Commit 0dfcce2 contains some preliminary work on logLik().
• summary() should probably collect the information and outputs of other methods, so it might make sense to implement it last.
• stability() is not a priority right now.
• Phi() and Psi() methods seem to not offer much - a method to retrieve the companion matrix probably makes more sense.

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I'll add summary() tomorrow.
Besides that #27 could use some work.

(Remember to mention density != HPDI)

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Thanks @oDNAudio for adding the summary method.

I've split it up to return the coefficients and feed that to a print-method.

Medium term it might make sense to create more selected outputs and allow retrieving some HPDIs. But I think that can be done in another issue.

Closing this, as all must-add methods have been added.

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