fix(parity): rsync bwlimit units, --info categories, --ignore-errors deletion semantics

- --bwlimit: faithful port of rsync 3.4.1 parse_size_arg (default KiB/s,
  binary K/M/G/T/P, decimal KB/MB, KiB/MiB, decimals, 0 = unlimited, 512-byte
  floor, (size+512)/1024 quantization).  Unit tests + docs.
- --info: wire del/remove/name/flist/nonreg/progress to real FastSync events in
  rsync's line format (deleting PATH, sender removed NAME, name lines,
  'sending incremental file list', skipping non-regular file "NAME"); name no
  longer aliases copy; --info=progress drives the progress path and report_stats.
- --ignore-errors: match rsync's default -- a source I/O error skips deletion
  unless --ignore-errors, while the readable tree still transfers and the run
  exits 23.  Covers all delete timings and both send paths.

src/shared/log.h

@@ -21,7 +21,20 @@ typedef enum {
   LOG_INFO_MISC = 1u << 1,
   LOG_INFO_SKIP = 1u << 2,
   LOG_INFO_STATS = 1u << 3,
-  LOG_INFO_ALL = LOG_INFO_COPY | LOG_INFO_MISC | LOG_INFO_SKIP | LOG_INFO_STATS,
+  /* rsync categories that map to a FastSync event (emitted in rsync's line
+   * format): del (deletions), remove (sender-side source removal), name
+   * (transferred entry names), flist (file-list header), nonreg (skipped
+   * non-regular files), backup (backed-up files), progress (per-file progress). */
+  LOG_INFO_DEL = 1u << 4,
+  LOG_INFO_REMOVE = 1u << 5,
+  LOG_INFO_NAME = 1u << 6,
+  LOG_INFO_FLIST = 1u << 7,
+  LOG_INFO_NONREG = 1u << 8,
+  LOG_INFO_BACKUP = 1u << 9,
+  LOG_INFO_PROGRESS = 1u << 10,
+  LOG_INFO_ALL = LOG_INFO_COPY | LOG_INFO_MISC | LOG_INFO_SKIP | LOG_INFO_STATS | LOG_INFO_DEL |
+                 LOG_INFO_REMOVE | LOG_INFO_NAME | LOG_INFO_FLIST | LOG_INFO_NONREG |
+                 LOG_INFO_BACKUP | LOG_INFO_PROGRESS,
 } LogInfoFlag;
 
 void log_message(LogLevel log_level, const char* message, ...);