catch exceptions when getting mimetype in gui file manager
add drawing to attributes when component has a _repr_svg_
add drawing pane to gui object frame and remove drawing frame
working on expression connections for the gui
implement new get_connectivity function for Assembly to ultimately replace get_connections
work on client side of Assemblt Connectivity
Merge branch 'dev' into gui
working on dagre-d3 implementation of connectivity editor
probably done messing with d3
small clean up of connectivity data
checkpoint, adapting ConnectionFrame to use Connectivity data
implemented ability to connect expressions in gui ConnectionFrame
add scrollbar to gui autocomplete combobox, tweaks to ConnectionFrame
getting vtrees & array right in new gui ConnectionFrame (connections still broken)
made some changes to the tutorials and docs in response to a users comments
Merge pull request #1657 from hschilling/P56547930-fix-tutorials

made some changes to the tutorials and docs in response to a users comments
Fixed bug in snippet showing basic assembly
Merge pull request #1658 from hschilling/P56547930-fix-tutorials

Fixed bug in snippet showing basic assembly
gui ConnectionFrame changes complete (aside from some resizing glitchiness)
need tests updated
a couple test and bug fixes
Docs reference Brent solver but BroydenSolver actually used
Merge pull request #1659 from hschilling/P56547930-fix-tutorials

Docs reference Brent solver but BroydenSolver actually used