[Bug 32558] Upgrade gtkmathview and add the abimathview plugin

[Ryan Pavlik]

Public bug reported:
https://launchpad.net/malone/bugs/32558

Affects: abiword (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
AbiWord 2.4.x includes the powerful new AbiMathView plugin which allows
equation editing and insertion from MathML or LaTeX.  It requires at
least gtkmathview 0.7.5 (2.4.2+ prefers 0.7.6 but works with 0.7.5) in
order to build and run.  No other additional dependencies are required
directly by the plugin.

Thank you for your help.