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Move the context creation to the _init routine so that modifications to main:: occur at initialization time, not when the file is loaded.
Normalized comments and headers to that they will format their POD documentation properly. (I know that the POD processing was supposed to strip off the initial #, but that doesn't seem to happen, so I've added a space throughout.)
Changed Parser.pl to MathObjects.pl
Updated to use new context methods.
Fixing docementation so that it can be read from the web.
Forward port to HEAD (Prevent "unquoted dx may conflict with future usage" messages.)
Now that the parser accepts multi-character variables, there is no need for the special treatment of dx. Also, allow the context to specify the default variable to use, and if not available, take the LAST varaible alphabetically, not the first. (x is more likely to be last, and the author might have added dx as a variable so that it will not cause an error if used in other answers in the problem, for example.)
Only add the 'dx' variable if it isn't already in the context.
Fixed a bug where if you specified a variable other than dx, the division by zero check didn't work properly.
Fixed typo in comments.
This file defines a DifferenceQuotient class that provides an answer checker for difference quotients. These include a variable "dx" (or a user specified one) that can be used as part of the formula, and the student must simplify the answer at least enough to remove the dx from the denominator.
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