fixed #290 using CismetExecutors.fixedThreadPool

instead of creating a new thread to check if a high res version of
stadtbild is available, a fixedThreadPool is used
Merge branch 'bug/290-stadtbilder-out-of-memory' into dev
build status icon
fixed #291
Merge branch 'bug/291-billing-product-download-exception' into dev
Merge branch 'dev' of github.com:cismet/cids-custom-wuppertal into dev
 #295 replace ImageIo with Imaging library in stadtbildutils
 #295 added dependency to commons-imaging

since the added dependency is only available as snapshot version, a
fork of the current snapshot was released in the cismet repository.
#295 removed obsolete paint method in stadtbildAggregationRenderer
fixes #296: added reset button to RissSuche and punktSuche
Merge branch 'feature/296-add-reset-button-to-RissSuche-and-Punktsuche' into dev
fixed #295. fixed imports and jalopy
Merge branch 'bug/295-stadtbild-aggregation-renderer-vm-crash' into dev
fixed #297 use WebAccessManager to request documents
Merge branch 'bug/297-no-bebauungsbplan-document-for-external-users' into dev
fixes #298 added reset button to landparcelSearch
Merge branch 'feature/298-add-reset-button-to-landparcelSearch' into dev
fixes #299: switch from apache.commons.imaging to ImageIO
Merge branch 'bug/299-Bplanrenderer-switch-from-apache-commons-images-to-ImageIO' into dev
fixed #301

each new valid Geschäftsbuchnummer is now stored in a
HashSet. All we have to do is to use the size
of this HashSet to have the correct value.