Renamed LFS_CKMETAPARITY and LFS_CKDATACKSUMREADS

- LFS_CKPARITY -> LFS_CKMETAPARITY
- LFS_CKDATACKSUMS -> LFS_CKDATACKSUMREADS

The goal here is to provide hints for 1. what is being checked (META,
DATA, etc), and 2. on what operation (FETCHES, PROGS, READS, etc).

Note that LFS_CKDATACKSUMREADS is intended to eventually be a part of a
set of flags that can pull off closed fully-checked reads:

- LFS_CKMETAREDUNDREADS - Check data checksums on reads
- LFS_CKDATACKSUMREADS - Check metadata redund blocks on reads
- LFS_CKREADS - LFS_CKMETAREDUNDREADS + LFS_CKDATACKSUMREADS

Also it's probably not a bad idea for LFS_CKMETAPARITY to be harder to
use. It's really not worth enabling unless you understand its
limitations (<1 bit of error detection, yay).

No code changes.

lfs_util.h

@@ -38,11 +38,11 @@
 #ifndef LFS_CKFETCHES
 #define LFS_CKFETCHES
 #endif
-#ifndef LFS_CKPARITY
-#define LFS_CKPARITY
+#ifndef LFS_CKMETAPARITY
+#define LFS_CKMETAPARITY
 #endif
-#ifndef LFS_CKDATACKSUMS
-#define LFS_CKDATACKSUMS
+#ifndef LFS_CKDATACKSUMREADS
+#define LFS_CKDATACKSUMREADS
 #endif
 #ifndef LFS_GC
 #define LFS_GC
@@ -65,14 +65,14 @@
 #ifdef LFS_YES_CKFETCHES
 #define LFS_CKFETCHES
 #endif
-#ifdef LFS_YES_CKPARITY
-#define LFS_CKPARITY
+#ifdef LFS_YES_CKMETAPARITY
+#define LFS_CKMETAPARITY
 #endif
-#ifdef LFS_YES_CKDATACKSUMS
-#define LFS_CKDATACKSUMS
+#ifdef LFS_YES_CKDATACKSUMREADS
+#define LFS_CKDATACKSUMREADS
 #endif
-#ifdef LFS_YES_CKDATACKSUMS
-#define LFS_CKDATACKSUMS
+#ifdef LFS_YES_GC
+#define LFS_GC
 #endif
 
 // LFS_NO_LOG disables all logging macros
@@ -240,16 +240,16 @@
 #define LFS_IFDEF_CKFETCHES(a, b) (b)
 #endif
 
-#ifdef LFS_CKPARITY
-#define LFS_IFDEF_CKPARITY(a, b) (a)
+#ifdef LFS_CKMETAPARITY
+#define LFS_IFDEF_CKMETAPARITY(a, b) (a)
 #else
-#define LFS_IFDEF_CKPARITY(a, b) (b)
+#define LFS_IFDEF_CKMETAPARITY(a, b) (b)
 #endif
 
-#ifdef LFS_CKDATACKSUMS
-#define LFS_IFDEF_CKDATACKSUMS(a, b) (a)
+#ifdef LFS_CKDATACKSUMREADS
+#define LFS_IFDEF_CKDATACKSUMREADS(a, b) (a)
 #else
-#define LFS_IFDEF_CKDATACKSUMS(a, b) (b)
+#define LFS_IFDEF_CKDATACKSUMREADS(a, b) (b)
 #endif
 
 #ifdef LFS_GC