Revert "COMP: Fix unused variable warning in BRAINSFitHelperTemplate"

This reverts commit 3d4de0ecd337e93b2066dbbeb4c9a6bb010dc7bb.
Revert "COMP: Fix shadowed declaration warning"

This reverts commit f4dfe9c0049d019d09a9a3a8cd4ba4aa6f09671b.
COMP: Removed deprecated V3 filters
COMP: Remove shadow declaration warnings