Fix locations / links in astropy.modeling Sphinx API docs
standardizing license headers in io.ascii package
Merge pull request #2165 from rastogitanuj/ascii_header_fix

Standardize license headers in io.ascii package
minor documentation fixes & comments in convolution
Prevent convolution of enormous (>1 GB) arrays unless explicitly
overridden by user.  This is important to catch situations in which
highly asymmetric cubes (e.g., a spectral cube with ndim = [1024,8,8])
are padded to become gigantic (1024**3 pixels, each with 8 bytes... and
you need 4 copies!!!)
need to check for that override parameter...
Exception -> ValueError
add "optional" flags
added a brief note about when 'convolve' is preferable
too much happened in this commit...
1. Rearranged convolve_fft and removed a redundant exception
2. Moved the memory exception before any duplication
3. added (in comment) the formula for total memory used
4. added a test (thanks @astrofrog for the memmap help)
minor change to comments
fixed boolean tests, order of operations, exceedingly slow bigarray test
(np.empty is better than np.memmap for this)
human readable times
:%s/,\([^ ]\)/, \1/g , even though I disagree with pep8 in this
particular context
Merge pull request #1990 from keflavich/convolution_fixes

Minor convolution fixes
Merge pull request #2148 from cdeil/sphinx_links_fixes

Fix locations / links in astropy.modeling Sphinx API docs
Don't generate the config file any longer, just keep it in the repo and
copy it over.
Add a test.
Remove save functionality from config
First pass at moving around all of the configuration options.  Tests passing.