Revert "Implement swipe to change tab, removing auto-hiding tabs"

This reverts commit 1816c4b47a269f6495b5ed9c42c8e0cd89f080bc.
reinstate tab switching
Don't simulate network lag for initial load of Social
Remove redundant code
Use the same colour coding for the graph as for the pseudo-histogram
Discard samples older than 5 seconds for graphing and statistics purposes

Previously, we incorrectly included them when calculating the standard
deviation.