replace deprecated ocrd workspace CLI constructs

Author: kba

README.md

@@ -480,7 +480,7 @@ installed in order to run any tests).
 # Miscellaneous
 ## OCR-D workspace
 
-* Create a new (empty) workspace: `ocrd workspace init workspace-dir`
+* Create a new (empty) workspace: `ocrd workspace -d workspace-dir init`
 * cd into `workspace-dir`
 * Add new file to workspace: `ocrd workspace add file -G group -i id
   -m mimetype -g pageId`

ocrd_cis/aio/aio.py

@@ -161,7 +161,7 @@ def addtoworkspace(wsdir, gtdir):
 
     _, _, files = os.walk(wsdir).__next__()
     if 'mets.xml' not in files:
-        initcmd = 'ocrd workspace init {}'.format(wsdir)
+        initcmd = 'ocrd workspace -d {} init'.format(wsdir)
         subprocess_cmd(initcmd)