Added several functions to enable Elevation Profile charting: renderElevationChartToDiv() et al

Expanded handleClick_Trail() to draw Elevation Profile charts in the slideout, along with the other trail info

Adjusted #page-map-info panelclose event handler, to destroy the SVG chart; on Android 2.3 it remains visible after the slideout is close (disobeys visibility & z-index ?)

Adjusted resizeMap() for better reliability on Android 4