BF(TST): reduce debugging targets only to those we have control of output over

i.e. disable SMLR, SG_.*, LIBSVM.  I could not figure out entirely correct regular expression
and was surprised that we do not have ability to "invert" the pattern, thus more TODO for
proper solution but for now should suffice
BF(TST): workaround for testing on older numpys with defective memmapping or smth like that

Otherwise segfaults
https://travis-ci.org/yarikoptic/PyMVPA/jobs/15248949\#L1693
while operating on memmapped .nii