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
DataSet::guessChunking: explicitly use std::abs instead of abs
Make 'name' attribute obligatory.

Name is now fully obligatory, being required in all relevant ctors and being supplied in all relevant tests.
none_t-delters for name have been removed, getters adopted to throw error if name missing, setter to throw error on empty string.
[travis] Exclude "build" and "tmp" dirs from coveralls.io report
[travis] Only do coveralls reports if we have them, i.e. cc==gcc
[travis] Nope. Don't exclude "build", where the gcov files are
Merge pull request #202 from gicmo/coveralls

[travis] Adjustments for coveralls reporting
Merge pull request #203 from balint42/name_obligatory

Make 'name' attribute obligatory
Merge pull request #204 from gicmo/DS_abs_fix

DataSet::guessChunking: explicitly use std::abs instead of abs

lgtm
Merge branch 'master' of https://github.com/jgrewe/pandora-1 into position_extent
Add kdevelop files to .gitignore
Some additions to Contributing.md
More additions to Contributing.md
s/Pandora/NIX/
Contribution.md: changes based on team member comments
Contribution.md: fix some small errors
Add pkg-config file for developer joy