[Toybox] [PATCH] Support fractional seconds (and other time units) in `top -d`.

[enh]

LTP uses `top -d 0.1`, which isn't convincingly useful, but general
support for other time units might be useful, and switching to xparsetime
addresses both at once.

Also fix 3169d948c049664bcf7216d4c4ae751881099d3e where I mistakenly
treated `rev` and `toys.optflags&FLAG_b` as interchangeable. (Without
this second fix, `top -b` looks fine but `top` is broken!)

Also fix xparsetime to reject input such as "monkey" or "1monkey".
---
 lib/xwrap.c     | 10 +++++++---
 tests/top.test  |  6 ++++++
 toys/posix/ps.c | 23 +++++++++++++++--------
 3 files changed, 28 insertions(+), 11 deletions(-)
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