Fix bug not getting convert factor for question channel

Closes #152, #151, and #149

See merge request !168

Fix problem with detecting data type

See merge request !172

correct convert factor for Centaur's VPB

Closes #159

See merge request !174

fix bug for path's name when saving GPS file

Closes #140

See merge request !162

Correct RT130 disk usage display

Closes #148

See merge request !171

This reverts commit 41a9988b.

We are currently skipping waveform files by inspecting the name of the
file. However, for some Centaur and Pegasus data sets whose station name
match a pattern used to filter waveform files, all their files are
skipped. We fix this problem by moving the check for waveform files.

Modify Pegasus VE2, VEI convert factor

Closes #156 and #155

See merge request !169

Fix bug happen when select 2 folders with different type

Closes #141

See merge request !163

Fix bug happen when user stop the process before data object is created

Closes #143

See merge request !167

make event DS when there are requested for waveform though TPS and RAW checkboxes aren't checked

Closes #139

See merge request !164

modify on_pick_event() to print out info of all lines if data point clicked can match with more than one SOH lines, and change to call show_log_entry_from_log_indexes() to highlight all of those lines in message dialog

modify plot_up_down_dots to plot correctly 1, 0 values no matter of the order they are entered into DB

make get_index_from_data_picked() return the list of indexes that the data point clicked represent for

disable not used gui items

See merge request !161

Add functionalities to config handler

Closes #87 and #103

See merge request !118

Correct clicking data point for info

Closes #134 and #86

See merge request !159

Fix channel preferences can't be deleted

Closes #136

See merge request !160