re-checkin initial implementations
Use temp version of Sorted to allow a portion of PQ impl to be uncommented.
Added another type parameter
Copied Queue, AbstractQueue, and PriorityQueue from src/dl, fixed some type parameterization, and added some basic tests. Added control for -warnunchecked in user properties file.
Moved main source rooted at . to ./src/main Moved test source rooted at ./etc/testcases to ./src/test
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