Pull request #682: Format of timerange flagging matters when using a flagging list and tbuff
Merge in CASA/casa6 from CAS-13664 to master
* commit '86368e193bba36b9d25f17a5f99b1957e2cd6545':
be strict about 3 '/' separators in dates, CAS-13664
check date separately for t0 and t1, CAS-13664
add tests for when t0 has date but t1 doesn't, CAS-13664
fix ticket number in comment, CAS-13664
remove old and largely duplicated readParseTbuff, CAS-13664, CAS-13664
list mode w/ tbuff: handle time-only timerange, CAS-13664
test list mode w/ tbuff and time-only timestamps, CAS-13664
