PSAMM 0.16

• Add an option to randomsparse to perform the deletion based on genes instead of reactions. This uses the gene association expression defined in the reaction property genes.
• Add threshold option to fva command.
• Fix bugs in gapfill that resulted in the procedure not detecting reactions that could be reversed, and sometimes failing to find a result at all.
• Add epsilon option to chargecheck and ignore charge imbalances below the epsilon value.
• Allow the search command to find reactions containing a specific compound even when the compartment is not specified.
• Output more information is the result of the search command.
• Improved handling of flux bounds at infinity (e.g. with default_flux_limit = .inf in model.yaml).