[Libreoffice] [REVIEW] Fix crash from forms.OGridControlModel unoapitests

[Bjoern Michaelsen]

Hi all,

please review: 
http://cgit.freedesktop.org/libreoffice/components/commit/?id=19ed36590e990b5281da9c54bd962031bd56ae82
http://cgit.freedesktop.org/libreoffice/libs-core/commit/?id=f25b836319678ab333a1a997cc7fdadfedad8e08

* various forms.OGridControlModel tests segfaulted
* root cause is the migration to stl containers in DbGridControl
* the old tools container returned the removed pointer or NULL causing
  no failure
* a signed int was used as index while the functions returned a
  unsigned int
* the GRID_COLUMN_NOT_FOUND magic value was out of the signed range

for both 3-4 and 3-4-0 branches.

Best,

Bjoern

-- 
https://launchpad.net/~bjoern-michaelsen