[WWdevel] bugfix release 2.2.2

[Sam H. <sh...@ma...>]

Hi All,

You may have noticed -- I released WeBWorK and PG 2.2.2 yesterday. It  
contains a few bug fixes and minor new features. Most of these are  
backports of fixes to HEAD from Davide Cervone. Thanks Davide. It  
should be safe to update running 2.2.x installations. There are no  
database or config file changes. Please let me know if you run into  
any difficulties updating. For full release notes, visit:
<http://devel.webwork.rochester.edu/twiki/bin/view/Webwork/ 
WeBWorKRelease2pt2pt2>
<http://devel.webwork.rochester.edu/twiki/bin/view/Webwork/ 
PGLanguageRelease2pt2pt2>

Enjoy.
-sam

Here are the changes:

* Updated to jsMath version 3.3c. See http://www.math.union.edu/ 
locate/jsMath/changes.html for details of the changes.

* Fixed a problem where WeBWorK assumed that columns were in a  
specific order in the database. Now, columns can be in any order.

* Make the Hardcopy Generator edit links use the same window as other  
edit links.

* Improve wording and fix typos in various modules.

* The Library Browser now indicates if a problem is already listed in  
the target set.

* Fixed a spurrious security error when previewing course info and  
set header files.

* Enable viewing of the default set and hardcopy header files in the  
PG Problem Editor. (This allows the files to be saved to the course  
templates directory for editing.)

* Fixed some problems with the Diagonstics output for Formula  
objects. (The tolerances used in the diagnostics didn't always match  
the ones used in the actual testing, and the wrong values were  
sometimes displayed when a multi-variable function was displayed as a  
graph.)

* Use tolerance flags from the Real object itself, if available,  
before looking at the context.

* Fixed a problem where polynomials like x+4x would be accepted even  
in single-power mode. The initial x was not being identified as a  
single power of x correctly.

* Ensure that ImageGenerator settings are correctly included from  
WeBWorK::Constants in all cases.

* Security: Since problems can provide their own graders, problem  
authors could previously use call PG_restricted_eval in a custom  
grader to gain access to the full WeBWorK environment. Graders are  
now evaluated in the PG safe compartment, preventing this.

* Fixed a spurrious warning in images mode when a hint or solution  
contains math expressions.

* FUNCTION_CMP now preserves the correct answer exactly as typed  
rather than reconstructing it from the parsed version.

* Fixed a problem with derivatives of constant-valued Matrices,  
Vectors, and Points. They were incorrectly getting an extra level of  
nesting.