Create function _reduce_data, which reduces a segment of data to
    a representable version with length equal to figure's width in pixels
    by using a min/max approach
Modify on_xlim_changed to call _reduce_data
Create a new function named 'plot_specgram' to create an spectrogram
    and plot it on a given axes.
Create a new module utils.plotting
Move 'plot_specgram' and 'reduce_data' functions to utils.plotting
Create a new function plotting.adjust_axes_height, which adjusts the height
    of a plot to the range of the y values of its lines plus a margin.
Modify SignalViewerWidget to call adjust_axes_height after loading a new document
Fix SignalViewerWidget to delete specgram.axes images after closing a document
Merge branch 'feature/faster-plotting' into develop
Rename gui.views.converted package to gui.views.generated
Create a new directory res/images containing oxigen-icons needed
Create a qt resource file res/icons.qrc to process the icons, compile it to a
    qr_icons.py file and store it into gui.views.generated package
Get needed icons from qr_icons.py
Create a playback marker for SignarViewerWidget and connect it to player tool bar.
Add icons for apply AMPA, STA-LTA, and Takanami methods, activate/deactivate
    threshold and application window.
Highlight selected events
Fix eventcommands.clearevents to also delete events in signal viewer widget
Create a context menu showed when an event is right-clicked with
    the following options: Apply Takanami to Event
Create a context menu showed when a signal selection is right-clicked
    with the following options: Apply Takanami on Selection, Create new event on selection
Create settings menus to be launched after selecting 'apply
    STA-LTA' and 'apply AMPA' actions
Check input values at ampadialog
Create a new function eqpickertool.gui.views.display_error, which
    displays an error message and traceback when an error occurs
    while performing a task
Fix settings dialog
Animate spanselector, eventmarkers and thresholmarker
Fix spanselector animation
Fixed SignalViewerWidget navigation to use blitting
Create a function clt.float_secs_2_string_msecs
Merge branch 'feature/animate-navigation' into develop
Create an about dialog with two tabs: version and license
Delete Edit->Create new Event
Delete Edit->Select All Events
Fix several playertoolbar errors
Add a 128x128 application icon to resources
Add to resources an html document 'version.html', which contains the text
    showed at About->Version
Add a script 'res/resouces.sh' to automate resources compilation
Adjust minmapviewer's y-limits after loading a new document
Set signal data to float64 after loading a new document
Set 'save as..' dialog size policy to expanding.
Modify spec files to build in Windows