Enable editing an existing dataset ; renamed and added classes for this
functionality;
pagination: link to previous and next page is now conditional
Merge pull request #42 from IDgis/dataset-editform

Enable editing an existing dataset ; renamed and added classes for this
Merge pull request #43 from IDgis/pagination-fix

pagination: link to previous and next page is now conditional
message handling moved to separate methods
PerformCount implemented
logger for harvester added
unused 'ImportCompleted' removed
Harvester and Loader improved

GetCount renamed into GetProgress
LoaderSession now expect a StartImport message containing a row count
database: object conversion factored out of jdbc context
generic database stuff moved into commons module
jdbc context is now public

this enables database actors to be defined in different packages
onReceive cleanup

message handling moved into separate methods and onReceiveNonQuery
method added
convert count result to long
loggers added
multiple database records are now packed into a single message
obsolete stuff removed