[trie] fix potential deadlock in CompareAndSwap

[mapof][flat] tidy up

update README

[seq] update README and comments

fix README

[mapof] deprecate mapof_opt_atomiclevel flags.

- Deprecate mapof_opt_atomiclevel flags.
  Automatic TSO detection is now always enabled.
- Add usage of ProcessAll() to README.

update README

update README

[mapof] fix compilation

[flat] tidy up