Update codeguide.rst

Fix typo.
Fix #2230: Make the progressbar work with the IPython qtconsole.
Add CHANGES entry.
Update si.py

Fix typo.
Merge pull request #2247 from larrybradley/patch-3

Update si.py
Update equivalencies.rst

Removed (nearly) repeated text.  I kept the most recent additions.
Merge pull request #2245 from larrybradley/patch-2

Update codeguide.rst
Merge pull request #2239 from eteq/fix-angle-multi-init

Fix Angle initialization for lists of quantities
Merge pull request #1786 from embray/parameter-names

Change parameter definition to not require stating the name twice
Corrections to ensure Distance can be compared.  Closes #2206
Merge pull request #2241 from taldcroft/cds-malformed

Add an option to guess the start of data for reading malformed CDS files
Update construct_table.rst

Fixed typo.
Update operations.rst

Fixed typo.
fixed AiryDisk2D model
updated changelog
updated changelog
Updated AiryDisk2D model docs
Merge pull request #2252 from larrybradley/patch-2

Update construct_table.rst
defined module-level constant for AiryDisk2D model; fixed bug with peak-pixel amplitude
changed AiryDisk2DKernel input parameter from width to radius to match AiryDisk2D model