Connect GPS dialog to the main window

Closes #19

See merge request !61

Checking endtime, starttime

See merge request !75

Fix bug in handling reading mseed

See merge request !83

DB config dialogs

See merge request !70

Extract GPS data based on data type

See merge request !78

Fix second ruler not showing up when zooming

Closes #49

See merge request !82

Warn user when they choose large data sets

Closes #17

See merge request !81

Date range chooser not displaying correctly

Closes #56

See merge request !79

read channels from header only

See merge request !80

Fix info box broken when plotting waveform

See merge request !84

Fix program breaking when plotting waveform or TPS with no channel chosen

Closes #46

See merge request !77

File information box

Closes #20

See merge request !68

get_tick_times(): handle boundary

See merge request !74

Select Mass Position channels

See merge request !65

Implement extracting Centaur and Pegasus GPS data

See merge request !57

Set not show DOY when open calendar to match with checkbox

Closes #53

See merge request !76

handle cancel for changing Main Directory

See merge request !73

close all other windows on closeEvent of Main Window

See merge request !72

handle case when no sta_id for waveform_data

See merge request !71

Update mseed.py: remove file_info['fileName'] to match with number of parameters for read_waveform_mseed()

Multi-thread TPS plot

Closes #2

See merge request !59