Revision 4622

backport (dpvc): Update to version 3.3g:

* When the AMSsymbols extension is loaded, the \mathbb macro is now
  changed to use the blackboard bold characters that are in the msbm
  font. (In the past, this would occur when the msbm font is first
  loaded, but the change should be made right away, since a use of
  \mathbb should cause the msbm font to load if it isn't already.)

* Fixed a bug introduced in version 3.3f that causes tex2math (when
  used with autoload) to cause MSIE/PC to stop processing display
  mathematics in some situations.

* Fixed problem with \longmapsto that caused gaps between the
  characters that form the arrow. Also worked around a problem with
  Firefox that caused \mapsto to lose its vertical tick at the
  left-hand end of the arrow.

* Fixed a problem with autoload where multiple calls to tex2math could
  cause tex2math to convert \$ to $ and then later try to interpret
  the $ as a start-of-math delimiter, even though it was previously
  escaped.

* Reorganized the autoload plugin so that jsMath.Autoload.Run() no
  longer needs to be called. In the past, autoload would use tex2math
  to look for text that needs to be converted to SPAN and DIV tags of
  class "math", but would not convert them itself. Now that autoload
  has settings to control what tex2math functions will be performed,
  there is no need to put off the conversion, so autoload now does the
  tex2math conversion immediately. The
  jsMath.Autoload.findMathElements variable is no longer needed, and
  so has been depricated.

* Fixed a problem with tex2math where two escaped dollars in a row
  would not be processed properly (the second would not be treated as
  escaped, and so could be treated as a start-of-math delimiter).