Release notes

This minor release contains a couple of fixes and enhancements since v0.3.0:

Fix confirm-checkout to also cover file checkout in the Status View.
Fix crash when diff view is empty.
Pop-up views can now handle mouse events.
Show diffs for unmerged files.
Added def command which enables user defined commands.
Added undef command to undefine user defined commands.
Added default-view config variable which allows a command to be specified to define the default view.
Added evalkeys command which can evaluate key strings sequences.

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