This update for sane-airscan fixes the following issues:

Ship sane-airscan in version 0.99.30:

  * WSD: sca:ScannerDescription requested in sca:GetScannerElementsRequest
  * WSD: Ricoh Aficio MP 201: fixed detection of "ADF empty" state
  * HTTP: logged "end of input" event 
  * test-decode: more informative usage when invoked without args 
  * test-devcaps: stub implementation 
  * test-devcaps: works for WSD 
  * WSD: fixed ADF duplex on Epson Workforce WF-3520
  * test-devcaps: works for eSCL too
  * Device model name propagated from zeroconf to proto handlers, for quirks
  * WSD: fix for ADF scan on RICOH Aficio MP 201
  * WSD: more information requested in sca:GetScannerElementsRequest
  * Some devices don't behave if sca:ImagesToTransfer isn't set as expected.
  * README: fixed OKI supported table entries
  * OKI-MB471/OKI-MC332dn/OKI-MC362dn marked as not supporting eSCL
  * Dell E514dw added to the list
  * Kyocera TASKalfa 3051ci added to the list
  * doc: add Epson ET-2650 series
  * Add EPSON WF-2760 Series
  * WSD: Add content type selection
  * eSCL: Add scan intent selection
  * Fixed logging of supported/chosen scan intent
  * eSCL: fixed parsing of the supported scan intents in the device capabilities
  * ID_SCANINTENT better documented
  * Tweaked a textual description of the scan-intent option
  * SANE name for ID_SCANINTENT_DOCUMENT now "Document" (was "Text")
  * Added ID_SCANINTENT_UNSET value for the 'sane-intent'
  * Setting "scan-intent" now requires a precise match.
  * eSCL: delay between subsequent loads made Brother-specific
  * WSD: cosmetic
  * WSD: workaround for ADF Duplex on Brother MFC-9370CDW
  * The "sane-intent" option cannot be SANE_CAP_INACTIVE