Added get_directory(), added early exit for mkdir() with empty directory.
Added cross-match caching to catalog building tools.
Added unit test for get_directory().
Ignoring 'bak' folder.
Improved feedback of catalog building.
Removed unused merging code.
Removed offset of coordinates in 'ad2xy'.
Added multi-dimensional version of 'total'.
Improved error message of vec::push_back.
Added 'qstack'.
Added 'qstack2' tool.
Added help text to qstack2.
Simplified wrap().
Made reflected structures properly copiable and movable.
Fixed 'read_args' with array objects.
Fixed mkdir() with multiple directories to create.
Added make_bins() and in_bins().
Added vec::clear().
Added fits::read_header().
Fixed bug in qstack and added a weighted version.