Added help text to fcolop.
Improved fits::setkey() to update the key if it already exists. Fixed fits::header2fits_ when a key is not commented.
Added the cut() function, slicing a string into parts of equal length.
Added a vec_t::resize() overload taking a std::array. Added error messages to append() and prepend().
Improved the unit tests of split().
Added the getgal tool.