* new functions: mesh/addHomologyRequest, mesh/clearHomologyRequests
    * changed argument of mesh/computeHomology + removed mesh/computeCohomology

- new optional arguments to model/addPhysicalGroup so that one can name a group at the time of creation

- pass optional dimTags to mesh/removeDuplicateNodes so we can merge nodes on parts of models

tutorial/ -> tutorials/

initializing the api now sets General.Terminal=1 (to print messages by default) and General.AbortOnError=2 (to throw an exception as soon as an error happens) - cf. #1043