This is a percentage bonus to breath regain while resting.
It could be applied to sleeping bags for example.
Reasonable values are from 0 (no bonus) to 100 (twice the regeneration).
git-svn-id: https://ja2svn.mooo.com/source/ja2_v1.13_data@1814 4f8fa57e-7814-0410-bad4-adc449f26b7c