Standarize solver 'validity of position' methods.
Full support for multiple solvers per object.
Beginning of support for more than one solver per object.
Restructuring for the solvers in the app.
Progeress towards automatically integrating the Algorithmic solvers into the list of solvers in the App.
Phased Solver app: debugging
minor
Bump to version 2.1.1 ; About dialog.
System library issue.
remove references to PurchaseActivity from manifest.
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