Adds the command-line options --protect-ids-noninkscape, --protect-ids-list and --protect-ids-prefix, and three options to the Inkscape Save as Optimized SVG dialog.
testscour.py: Add unit tests for Johan Sundström's fix for bug 722544, "SVG transform matrix() arg order is a1 b1 a2 b2 a3 b3, not a1 a2 a3 b1 b2 b3".
unittests/: Edit the unit tests' support files not to have a second line with the correct transformation. This is customarily in testscour.py.
Partial fix for bug 603987: Allow curves representing straight lines to become LineTo commands (and possibly HorizontalLineTo and VerticalLineTo afterwards).
Fix a bug whereby an initial M0,0 in path data is lost, making the path unrenderable.
Add unit tests for this.
Add some descriptions to the failure modes of some unit tests, which would fail without any message (if they failed, but right now they succeed! ;).
scour.py, scour.inkscape.py, scour.inx:
* Add options --quiet, --enable-comment-stripping, --shorten-ids, --remove-metadata, --renderer-workaround.
scour.py:
* Optimisations in time (so Scour runs faster) and space (so Scour allocates less memory, less often).
* Change #E+# to #e#, #E-# to #e-#, 0.# to .# and -0.# into -.# in path/polygon/polyline data + lengths, if renderer workarounds are disabled. Use spaces instead of commas in path/polygon/polyline data. Use lower-case #rrggbb and #rgb instead of upper-case. All of this makes gzip work better, since the rest of SVG documents mostly has lower-case letters in tag names and spaces to separate XML attributes etc.
* Fix a bug whereby an SVG document would become filled with black if all elements had the same fill color.
* Fix a bug whereby a path's second command would not start at the right coordinates if the first command was a relative moveto 'm' with at least 1 implied lineto.
* Fix a bug whereby a path's absolute lineto 'L' commands would not become the right relative lineto 'l' commands.
* Allow the implicit linetos after a path's moveto 'M'/'m' to be converted into relative horizontal linetos 'h' and vertical 'v' too.
scour.inx:
* Fix help typos. Make options more descriptive in the plugin option window. Add something about enable-group-collapsing requiring enable-id-stripping.
testscour.py:
* Rework tests that relied on #E+#, #E-#, 0.# and -0.# so that they accept the changes to scour.py. Add unit tests for strip-xml-prolog, enable-comment-stripping and remove-metadata.
