rOpenGov/iotables: 0.9.3 CRAN release

This CRAN release focuses on stability, documentation, and preparing the ground for a forthcoming major release:

• Dependencies: Updated for modern dplyr and tidyr, removed use of dplyr and plyr functions 
• Bug fixes:
  • Restored reproducibility of the germany_1995 dataset from the Eurostat Manual (Beutel, 2008).
  • Corrected documentation mismatches for datasets and test results.
• Documentation:
  • Expanded vignette on terminology (work in progress) to align future terminology with Eurostat, UN, and OECD manuals.
  • Clarified dataset origins (netherlands_2000, uk_test_results, germany_airpol) and improved examples/tests against published results.
  • Improved developer notes in data-raw/ to ensure reproducibility of bundled datasets.
  • Improved and modernised testthat suite for better unit testing and 153 new unit tests.

This version maintains backward compatibility with previous 0.9.3 (CRAN) releases, while setting the stage for a future 1.0 release with extended SIOT sources, enhanced reliability, and new functionality.

Please take a look at the iotables: an r Package for Reproducible Input-Output Economics Analysis, Economic and Environmental Impact Assessment with Empirical Data manuscript to describe in more detail for a journal submission the methodology and further development philosophy of iotables.