Fix several things that were broken in recent revisions. #19
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Remove the CodeMirror eclipse theme, and just use the default. This is the same default used in the PGProblemEditor for webwork2, and is actually very similar to the eclipse theme. If you don't like the dark theme, then we should just use the default.
Increase the width of the sidebar to fit the content.
Make the dropdown show the correct label when the macros page is selected.
Remove the "default" tab pane and hidden sidebar item. The instructions that were in the tab pane simply aren't needed. This is a straightforward page with not much else to do. In addition the hidden list-group-item completely messes up the sidebar appearance.
Remove the duplicate "parserFormulaUpToConstant.pl" key in macro_pod.yml, and add the missing "parserAutoStrings.pl" macro that is referenced in "doc/sample-problems/problem-techniques/StringsInContext.pg". Since this was not in the yml file, this caused a use of uninitialized value in string concatenation warning, and obviously the link didn't work.
Also fix several issues with the documentation in the graph tool problems.