SimpleTag::units accepts empty string as valid unit
new method to get offset and count NDSize objects for simpleTags
documentation of positionToIndex
Test for util::getOffsetAndCount
bugfix in checkDimensions. Could not handle more than 1D, bad
implementation
add forceUpdatedAt to setter for units
implementation of offsetAndCount for dataTags, according tests
removed old-style casts with static_cast :-)
DataType: + data_type_to_string function

The ostream operator now uses this function.
[CMake] Fix debug compile flags for gcc
Merge branch 'master' of https://github.com/G-Node/pandora