Batch Calculator v0.1.2

Main changes in the newest version:

Corrected a bug in the TeX report when rescaling to sample size.
Updated the database schema for two tables to remove incompatibilities when working with sqlitebrowser.
Updated the chemicals table in the database to include densities, pka, smiles.
Added an option to change database in the window for calculating the composition from masses of reactants.
Corrected the labels displayed in the ListCtrls.