TinyXML separated from source into its own external package. Still using the TinyXML provided by the system, if found.
Add the possibility to read and display Altitude data
( at 300,500,700,850 hPa)
If there is no 'altitude' data in the current file, nothing visible is changed
If the current file contains altitude data, a choice box is display
near left side of the parameter WIND .
The box give acces at the data available. (10m for the normal
data, 300 or 500 or 700 or 850 ).
If one of the altitude available is chosen, the wind data shown
 in the dialog and the wind overlay are related to this choice. In addition,
a line of extra data is displayed at the bottom sohwing Altitude,
Temperature, and relative humudity
All the 'altitude data are marked by a yellow background
Off course for those wanting to use another units than
hPa,meters and Celsius, it is possible.
Merge pull request #104 from Ptizef/master

Add the possibility to read and display Altitude data
Merge pull request #102 from mariokonrad/upstream-tinyxml

Refactoring: TinyXML separated from source into its own external package.
Introduce chart database Version 018, to include ChartFamily support.
Revert "Merge pull request #102 from mariokonrad/upstream-tinyxml"

This reverts commit 27b4d4c081e5035af12fc0b82898722dc4c28d0e, reversing
changes made to 3381e7a2805965ee8a26a09ed6e8103ec28df82e.
Correct NMEA GGA sentence parsing.
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into mainline

Conflicts:
	include/chartdbs.h
	src/chart1.cpp
	src/chartdbs.cpp
	src/statwin.cpp