Improve Diff dialog

Registered by Szilveszter Farkas

There are already some wishlist bugs reported against the Diff dialog and some other ideas are listed in the TODO file:
 - graphical display of differences between branches
 - allow specifying two revisions in the diff window rather then always diffing between base and working tree
 - diff window should show side by side diff (this involves integrating meld)

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
None
Definition:
Discussion
Series goal:
None
Implementation:
Not started
Milestone target:
None

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