Thoughts on repository version 6.

doc/FORMAT.md

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+# Thoughts on Repository Format 6
+
+# Info Format
+
+- Info format will be `JSON`.  Something like (but without whitespace):
+
+```
+[
+    {"pgbackrest":{"format":6,"version":<pgbackrest version>,"repo-id":<base32 * 16>,id:<base32 * 16>}},
+    {"content":...},
+    {"checksum":<sha(1/256)hash>}
+]
+```
+
+## Manifest
+
+- Save **all** options instead of the piecemeal saves that are done now.  These options are for informational purposes only so it would be fine to save them in a KeyValue or JSON blob.
+
+- Store default sections before file/link/path sections to avoid two passes on load.