Log Message:
Update to 0.14.1

Changelog:
ixion 0.14.1
* addressed a number of coverity issues.
* Fixed build issues on 32-bit platforms.
* fixed warnings on shadowed variables during build with -Wshadow
  compiler option.

ixion 0.14.0
* implemented MMULT built-in formula function which makes use of the
  grouped formula support.
* added support for grouped formulas.
* added experimental compute engine framework to potentially accelerate
  certain computations in the future.  It's not used yet.
* refactored formula cell storage to use ref-countered formula cell
  objects.