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Change history of rivernet package
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Changes version 1.0 (16.10.2014) -> version 1.1 (xx.xx.2017)
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PR: Merging of reach and node attributes in case of multiple files:
    "rbind" replaced by "merge".
    A description of the types of merging was added to the help file.

PR: Description of value of "analyze" corrected. 

PR: New member function "getnodeind"

PR: Error analysis improved in rivernet.read

PR: Sorting of reaches according to identifiers removed

PR: New member functions "rivernet.write" and "prune"

PR: Addition of additional criterion "crit.node" to function
    "adjacentreaches"

PR: Additional output for very large river networks (> 10000 reaches)
    and modified order of file reading and analysis (to get read 
    errors earlier)

PR: Option to write only selected sub-networks in rivernet.write added.

PR: Error message for non-availability of altitude information removed.


