Override times() in DiscontinuousTrace to

Modify EH/ET packets are stored to include necessary information that
was truncated before

Fix time precision issue by getting nanosecond directly from stored
UTCDateTime instead of UTC timestamp

Fix the millisecond part of time in header being parsed as microsecond

combine get wf plot info to get chan plot info

Closes #112

See merge request !131

write new mseed that use record_reader for fast and simple data

See merge request !134

display tracking info when start reading new files

Closes #102

See merge request !127