1. the shell should not remove escape sequence \' and \" in a string.
2. `tsParseTime` should not unescape the next string token (this issue
appears after the first issue was fixed).
3. `value[4] != '-'` in `tsParseTime` crashes in rare case if `value[4]`
is in unallocated virtual memory.
4. `operator[x]` and `delimiter[x]` may result in unexcepted behavior
as string is utf-8 encoded and `x < 0` could be true.
5. changes the behavior of `tscGetToken` a little: now, unescaped single
quotation is allowed in double quoted strings and unescaped double quotation
is allowed in single quoted strings.
6. minor performance improvements and other improvements.

The mode argument must be supplied when O_CREAT or O_TMPFILE is
specified in flags for open(...).