fixes splatalogue issues, but goes a step (too?) further: declares
class_or_instance as a decorator using the decorator module, which is
now a dependency
added copy argspec.  It didn't work, so next commit will revert the
changes
reverted decorator related hacks
finished reverting decorator hacks
fixed doctests and completely reverted all the magic I tried with
argspecs
Merge pull request #183 from keflavich/splatalogue-docfix-issue183

Fix Splatalogue.query_lines docstring