Blackboard patch

[Stephen Reindl]

The following patch allowes users which have included the ams-symbol pfb 
fonts into their X-fontpath to view and edit \mathbb (blackboard) characters.

If the msbm10.pbf-font is not in your fontpath or you cannot display Type 1 
fonts, the mathbb-characters are displayed with the font "fixed".

There's a new command "math-blackboard" which switches to blackboard 
characters. See the patch for details.

Stephen

blackboard patch