- Fixes system checks scripts to correctly handle errors when Rust and Cargo are not found.

- Update
`extraction.rs`

and`multipliers.rs`

in order to lower minimum supported Rust version from 1.71 to 1.67. - Set minimum version of rustc >= 1.67.1 in
`SystemRequirements`

. - Add system checks to rustc and prompt users either install, if
missing, or update when version is lower than specified in
`DESCRIPTION`

.

- New
`import_element()`

to programmatically import data from an Excel file - New data import addin makes easy to import data from clipboard or an Excel file
- New
`iom`

uses the efficiency of R6 classes - New
`add`

and`remove`

methods to add and remove elements from an`iom`

object - New
`br_2020`

dataset with a 51 sector Brazilian input-output table for 2020 - New
`compute_tech_coeff()`

and`compute_leontief_inverse()`

methods uses the power of Rust and`faer`

crate to substantially increase performance - New
`compute_multiplier_*()`

methods to compute multipliers from a given input-output table:`compute_multiplier_output()`

for the output multiplier`compute_multiplier_employment()`

for the employment multiplier`compute_multiplier_wages()`

for the wages multiplier`compute_multiplier_taxes()`

for the taxes multiplier

- New
`compute_influence_field()`

method to compute the field of influence of each sector - New
`compute_key_sectors()`

method to compute the key sectors of an input-output table, based on power of dispersion and sensitivity of dispersion, and their coefficients of variations - New
`compute_allocation_coeff()`

method to compute the allocation coefficients of an input-output table - New
`compute_ghosh_inverse()`

method to compute the Ghosh inverse of an input-output table - New
`compute_hypothetical_extraction()`

method to compute impact on demand, supply and both structures after hypothetical extraction of a sector - New
`set_max_threads()`

method to allow the user to control number of threads used by {fio} (required by CRAN).

- Use Rust instead of base R for
`compute_*()`

functions - Use
`faer`

crate instead of`nalgebra`

for faster linear algebra calculations - Use R6 classes for a clean, object state-changes, memory-efficient object-oriented programming

- Added assertions to check if elements imported into slots are
matrices at initialization of
`iom`

object and at`add()`

method - Added assertions to check matrices dimensions at initialization of
`iom`

object and at`add()`

method - More informative warnings and errors messages with {cli} package
- Added assertions to check if number format of slots is
`double`

at initialization of`iom`

object and at`add()`

method - Fix build configuration to comply with CRAN policies