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Minor changes to iterate to support sub-second (16Hz) online data streams.

See merge request !21

Should have been returning the online trend if active.

data: better thread management

Closes #188

See merge request !20

Some sort of race condition is causing premature thread dereference errors
(#188).  rather than try to cleanup the threads when they're done, this
just leaves them to be cleaned up when the thread slot is needed again.

should close #188

remove weeks and nsecs, and separate with a ',' instead of a space,
for better visual separation between tick strings.

closes #191

Don't attempt to start online.

Selectable date and time representation

See merge request !18

Adds the option to select the date and time representation of the bottom axis tick strings. Options are relative time string, absolute GPS, and absolute date string in UTC or local time. The representation in online mode is fixed to relative time string.

closes #156

This truncation, needed because of lack of recent time in NDS servers,
is causing problems when transitioning from online to offline for short
time window.  hopefully this won't cause problems...

This limits the data accumulating in the data buffer to just what is needed
for the current display window, considerably speeding up rendering.

There are more ctypes in the wild than I realized, so we should have a
way to handle unknown ctypes.  The unknown ones all seem to not be
trend types, so falling back to "raw" should be sufficient.

closes #186

QTimer import issue

closes #183

closes #181

smoother update

closes #179

caused exceptions in some circumstances

Fixed export of background color. Added export of font size.

See merge request !17

fixes: "DeprecationWarning: invalid escape sequence \."

respect the user's choice even for online mode.

getting these numbers right is tricky

This is causing skew at the right edge in online mode.

Add a "trend" tab that allows for fine grained control of the trend being
displayed.  Includes default option for "auto" trend, with control over
span transition thresholds.