ENH+NF+BF: coverage testing of cmdline examples + fixes to cmd searchlight

PRing all at once to see if travis works with this.
I still consider this to be just a temporary workaround until we come up with proper testing of 'run's of those cmd_ beasties - they expose many options and we better provide at least some reasonable set of combinations for those

as for tutorial_data_25mm -- ideally may be it (and its attributes) could be either downscaled in time (or just now came to it) -- we could simply cut it e.g. in half or even to e.g. 3 chunks since it to be used reasonably only for testing (although classification results actually do not look too bad ;) )

uff -- this PR incorporated a range of "fixes" to hdf5 backend.