Changes planned on test scripts

[jcliberatol]

• refactor unit functions for better naming
• separate unitary functions for each package
• reprogram the reduce steps to take new statistics
• extract number of em iterations

[jcliberatol]

New changes :
-Refactor ordering by field to execute calls to functions since it calls big datasets first.
-Implement iteration saving for mirt
-Implement outputting estimations and latent traits to db.

[jcliberatol]

• Implement writing to file fast in simulation.