Code cleaning
SqlAlchemy echo parameter as explicit false
Minor changes in OSM and GMaps usage
Show Google maps satellite at closer zooms.
Alfa version of the positions history viewer

It includes a slider, a play/pause button and
two datepickers for selecting a range.
It can be accessed through a new button, which
resembles a calendar, inside the popovers
Also made other minor changes in the GUI.
Beta version of the positions history viewer

It now includes some shortcuts for specific dates
and intervals. Interface is now more nice looking.
Also added a modal dialog which informs the user
when there are no positions for the selected date/
interval.
Position history viewer interface improved
Adde a spinner for history positions loading
Added max number of history positions limit

It can be configured inside the ini files.
The web service in fact returns the max + 1
so the JS code may know that there are more
positions in storage.