Blender Git Loki

Revert "Fix T47902: Particle grid not using modifier stack."

This reverts commit 2bd3acf7cd27c0c3ee77b10d56b91c3b03226d39.

Commit is valid in theory - but in practice, it means nearly all edited hair systems
would need to be re-created from scratch... Not nice, so better revert and note in code
that particle distribution is ugly and does not respect 'use modifier stack' option in most cases.