Fix a couple of crashes with empty matrices. Some small optimisations.

Correctly handle descenders on text when plotting labels.  Minor layout
improvements.  Add some drawings of what's going on in the port matrix
so that I don't keep losing them.


git-svn-id: svn://localhost/ardour2/branches/3.0@6319 d708f5d6-7413-0410-9779-e7cbd77b26cf

3 files changed, 1812 insertions, 0 deletions

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new file mode 100644
index 0000000000..d623ccc01e
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index 0000000000..d5669c3e8d
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