TinyXML separated from source into its own external package. Still using the TinyXML provided by the system, if found.
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.
Improve some code without any fonctionality change
Correct inconsistency when alternate between one date/time and
multi-date/time files
Minor code improvement
Add possibility to request e-mails including altitude data (300,500,700,850 hPa)
- putt all request code in separate files
- add altitude parameters selection
- modify dialog to suppress pop up for moving data typing