deprecate following labs modules: bindings, glm, group and utils.routines
disable linking with system Lapack by default
Reflect MB's comments re warnings traceability
Merge pull request #304 from alexis-roche/deprecate-labs

MRG: Deprecate labs

This PR reflects the recent mailing list discussion on the nipy.labs subpackage and implements two preliminary steps towards removal of the nipy dependency on Lapack:

1) deprecate all labs modules that depend on Lapack: bindings, glm, group and utils.routines. It is up to Bertrand and Gael to decide about the status of their labs modules and preferred migration strategies, given that the said modules are Lapack-free.

2) disable linking with system Lapack by default.