#16 various functionality added

[raik nagel]

- open declaration/follow link for the /input{file}, /include{file} ... commands
- fix xdvi parameter (there was a problem at the sourceposition parameter), see ViewerAttributeRegistry.java for more details
- new annotation type: ParserHint. It's used by the parser for reporting some hints, like umlaut or illegal character found.
- insert a texteditor action: correct umlaut
- load additinal (user depend/defined) latex commands from latex.txt file
- file proposal-list for the \input, \include, \includeonly and \includegraphis commands (inspired by sf-patch 1556192/1470934)
- bugfix: if a tex file is open and the texclipse project is closed there was a NullPointerException (only at eclipse startup!?!)
- insert environemt proposals (\begin{xxx} \end{xxx})
- insert the "soft enter" property at TexEditorPreferencePage.java

[raik nagel]

[daniel309]

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great patch, works perfect. im using it on an every-day basis now.

I would suggest to include the code into the main branch.

daniel.