BF: type --volume to be int, and a typo fix

[yarikoptic]

No description provided.

[coveralls]

Coverage remained the same at 80.056% when pulling ba5e58f on yarikoptic:bf-minor into d585c1c on PyMVPA:master.

[codecov-io]

Codecov Report

Merging #528 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #528   +/-   ##
=======================================
  Coverage   76.65%   76.65%           
=======================================
  Files         364      364           
  Lines       41341    41341           
  Branches     6667     6667           
=======================================
  Hits        31691    31691           
  Misses       7755     7755           
  Partials     1895     1895

Impacted Files	Coverage Δ
mvpa2/cmdline/cmd_scatter.py	71.42% <ø> (ø)	⬆️
mvpa2/datasets/cosmo.py	85.18% <ø> (ø)	⬆️
mvpa2/tests/test_searchlight.py	92.72% <0%> (-0.26%)	⬇️
mvpa2/tests/test_usecases.py	99.28% <0%> (+0.35%)	⬆️

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