engression 0.1.6

• Fixed examples to check for torch backend availability via torch::torch_is_installed() before running, avoiding errors on systems where the Lantern library is not installed.
• Fixed a bug in predict.engression() where parentheses were misplaced in a dimension check for quantile predictions.
• Changed default dropout from 0.05/0.01 to 0.0 in engression() and engressionfit(), and updated documentation to match.
• Removed reference to non-existent engressionBagged function in documentation.