Huge Database Upgrade related to the images

This is a huge commit with the following changes based on the issue
task: https://github.com/barriespotter/Web_App/issues/1

* The images are now in a separate table (sql file included in this
commit)
* Previous image fields have been deleted in the table of the output
and live.
* When a new entry is added (on both the live and output tables), it
will first check if the image already exists and if yes then don’t do
anything, otherwise google the image of the aircraft and save the url
in the new table
* The flight profile page has now only the main image and the slideshow
has been removed
* The advanced search feature to search only for results that have
images has been removed, since that workflow doesn’t really work with
this new upgrade. Perhaps in the future we can figure something out.
This also affected pretty much all the search output files.
* PHP functions for statistic pages that show aircraft images have also
been updated to use the function that gets the aircraft images from the
new table.
* Lastly on a unrelated event, removed all the styles from the old
index file.