Updated the generated station xml to mirror web service.
Added a reset option to partitions and queries.

The new option allows for all existing data to be removed before running the file copies. Makes a clean start to the data.
Enabling hash based join.

The changes involve two new rules that allow switching between Algebricks Builtin Identifiers and VXQuery equivalent expressions. One more rewrite rule was included to move expressions out of the inner join to allow for hash join to be enabled on variables. Other changes connect these rules to allow for complete hash join implementation.
Query update to work with generated data on smaller data sizes.
Improve search for functions based on things I learned from join.
Removed change to comparator factory provider.

The change removed all the result for the join operation.