pytacsadapt updates

[bradenfrigoletto24]

A set of small updates made to the pytacsadapt interface.
Recent changes include:

• Fixed a minor typo found in QuadForest::getNodeConn()
• Updated the error localization for quads; placed the absolute value sign after the sum for an element to allow for error cancellation between the different basis functions within an element
• Changed the total output error evaluation to be the sum of the element errors instead of the nodal errors
• Updated the model history storage to have the output correction stored in its own group
• Updated the .gitignore to now ignore *.hdf5 files, which is the format used for the pytacsadapt model history information
• Updated the simple plate example for demonstrating pytacsadapt