Merge pull request #24 from opengm/RC-2.3

from rc2.3
Merge pull request #25 from opengm/RC-2.3

from rc2.3
Merge pull request #251 from joergkappes/master

minor bugfixes
Merge pull request #252 from joergkappes/master

TRWS : dual bound change as stoping condition
Merge pull request #253 from joergkappes/master

minor changes for speed up code
Merge pull request #254 from joergkappes/master

significant speed ups for some methods
Merge pull request #255 from joergkappes/master

speedups
Update lp_reparametrization.hxx

wrong datatype IndexType in accumulate changed to LabelType
Merge pull request #256 from joergkappes/master

bugfix io with empty vectors
Merge pull request #26 from opengm/master

from opengm master to my fork
added code to get fractional ad3 solutions
changed example a bit
changed example a bit
Merge pull request #257 from DerThorsten/master

added code to get fractional ad3 solutions
Merge pull request #258 from yanlend/RC-2.3

Update lp_reparametrization.hxx
Merge pull request #66 from opengm/master

update from opengm:master