Change HTTP request buffer pointers from (const char*) to (char*)
because some Rhizome operations can modify received data in-place, eg,
when decrypting it.
Remove interactions between rhizome_manifest_set_filesize()
and rhizome_manifest_set_filehash(), since any inconsistency
is caught by rhizome_manifest_validate() in any case
The rhizome_open_write() function now accepts RHIZOME_SIZE_UNSET as the
payload size, and streams into an external blob until finished, then
copies the external blob into the FILEBLOBS table if it is small enough.
Needed so that HTTP GET /restful/rhizome/insert can stream the payload
directly into the DB even if the supplied manifest does not specify
'filesize'.
Refactor a lot of Rhizome bundle storage code to use the new "enum
rhizome_payload_status" instead of mysterious int values to represent
the outcome of the operation.
Formalise add-bundle result in "enum rhizome_bundle_status"
Rewrite rhizome_manifest_finalise(), rhizome_find_duplicate() and
rhizome_add_manifest() to return enum rhizome_bundle_status
New function rhizome_manifest_check_stored() that compares a manifest
with its stored counterpart and returns enum rhizome_bundle_status
Remove redundant rhizome_manifest_check_sanity(), consolidating all
manifest validation rules in rhizome_manifest_validate(), which now
checks the 'id' field is present, and that 'sender' and 'recipient' are
both present for MeshMS
Correct manifest finalisation logic: set the 'finalised' flag in
rhizome_manifest_validate(), not in rhizome_manifest_verify() (which
sets 'selfSigned'), and consistently clear 'finalised' flag in all
attribute setter functions
Remove manifest 'ttl' field and all references thereof (leaving unused
space in Rhizome BAR)
Rename some payload functions for clarity
Instead of int64_t. Fixes some -Wsign-compare warnings.
Replace sqlite_exec_int64() with sqlite_exec_uint64().
Also store rowid as uint64_t, and use 0 not -1 to indicate
unset.
This may have been a reversion to older code caused by a careless
merge, because the change to RHIZOME_SIZE_UNSET was already made
when read_state.length was changed to unsigned.
Fixes some -Wsign-compare warnings
