varPro 3.0.0

Improvements

Refactored varpro.strength() to reduce R-side post-processing overhead after the native varProStrength call, improving performance on large forests and large membership reconstructions.
Improved scalability and stability of varpro.strength(..., membership = TRUE) for very large analyses.
For RHF grow objects, varpro.strength() now uses the integrated hazard exposure values stored on the fitted object (int.haz.oob) as the default working response when available.
Internal cleanup of native-output decoding and membership reconstruction logic.

Fixed a failure that could occur on very large analyses when rebuilding membership lists in R after native execution, which could previously surface as an integer-overflow warning from cumsum() followed by a downstream missing-value error in membership reconstruction.

Major refactoring and enhancement to functions downstream from the entry varpro() function.

Improved ivarPro.
Refactored code to improve speed.
Eliminated or replaced mclapply() with PSOCK-based parallel execution, improving Windows compatibility.