Add Degree Symbol to Track Value

Add the degree symbol to the "Track:" value in the plane details
section.
Change the Background Color for a Plotted Plane

Changed the background color for a plotted plane in the planes table to
something that was more easily visible.
Improve map display layout and styling
Don't restrict sidebar width
Fix --gain with fractional gain values.
Reject out-of-range latitudes when doing CPR decoding.

If a CPR message with an undetected error is received this can produce out-of-range results for latitude.
e.g. even latitude of 78000, odd latitude of 0 produces a latitude index j=35 and rlat0 = 213.
Don't output message reception time in SBS format for remote messages.

For remotely received messages that have a mlat timestamp, we have no
useful way of turning that timestamp into a wallclock timestamp, so
don't try, or we'll just produce wildly wrong results (_days_ in error)
Merge pull request #39 from mutability/fractional-gain

Fix --gain with fractional gain values.
Merge pull request #40 from mutability/discard-bad-cpr-latitudes

Reject out-of-range latitudes when doing CPR decoding.
Merge pull request #29 from tslocum/bettermap

Improve map display layout and styling
Merge pull request #27 from ddeitterick/format_track_field

Add Degree Symbol to Track Value
Merge pull request #28 from ddeitterick/change_plotted_plane_table_bg_color

Change the Background Color for a Plotted Plane
Undo Parts of Pull request #29

The table sizing doesn't seem to work in M$ IE8 and IE9.
Read Files are binary

When replaying recordings, the read files are binary, so the file open
needs to reflect this so that spurious end of file characters aren't
misinterpreted.
Merge pull request #41 from mutability/skip-remote-timestamps

Don't output message reception time in SBS format for remote messages.
Only use O_BINARY on Win32
Merge pull request #44 from mutability/fix-obinary

Only use O_BINARY on Win32
Merge branch 'master' of https://www.github.com/MalcolmRobb/dump1090 into http_server_wk