First step of improvement of RTF import

- use nrtftree library instead of RichTextBox
- add RtfConverter class
Improve handling of multiline records

- support donation that spans two lines
- add contact person for organizations
- support multiline organizations (fixes issue #4)
Convert donor email from statement

Fixes #10
Enhance conversion to support TENDERED_AMOUNT/TENDERED_CURRENCY

Fixes #11
Update changelog file
Some cleanup
Update readme.txt

We now use .NET 4.0
Fix/improve multiline handling

Previous code has problems with regular donation where the
donor was split accross two lines.
More bugfixes related to multiline handling
Fix unit tests
Merge branch 'master' into xwt

Conflicts:
	Libs/linux/SilUtils.dll
	Program.cs
	TntMPDConverter.csproj
	TntMPDConverter.sln
	TntMPDConverterTests/TntMPDConverterTests.csproj
	released/changelog.txt
Cleanup