Merge pull request #190 from stopfer/RC-2.3

refactoring for new visitor
Merge pull request #49 from opengm/RC-2.3

update from opengm:RC-2.3
Merge pull request #191 from stopfer/RC-2.3

more refactoring for new visitor
Merge pull request #50 from opengm/RC-2.3

update from opengm:RC-2.3
refactoring visitor usage in lazy flipper
refactoring visitor usage in LBP and TRBP
refactoring visitor usage in Multicut, fix bug with constant factor
 comment unused typedef
uncomment callars for refactored methods
Merge pull request #192 from joergkappes/RC-2.3

Refactoring of LF, LBP, TRBP, and multicut
visitor refactoring
visitor refactoring
visitor refactoring - correct bound at begin
timeout name conflict
add refactored methods
Merge pull request #193 from joergkappes/RC-2.3

refactoring QPBO