[Dune] [#746] Extract 'function from expression' functionality from dgf parser

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Carsten Gräser (Carsten) 

Attached to Project - Dune
Summary - Extract 'function from expression' functionality from dgf parser
Task Type - Feature Request
Category - Grid
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.0)
Due in Version - Undecided
Due Date - Undecided
Details - There seems to be some kind of expression parser in the dgf parser that allows to generate functions from strings.

Since this functionality is in no way restricted to boundary projections it should be seperated from the dgf-parser and use the dune-common (virtual) function base class.

This would allow to use it also for the standard boundary segments, other grid formats, initial values, ...

A simple ExpressionFunction that can be constructed from a string would be nice.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=746

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