Add ID, File+Heading based Links to Org-Mode Entries

- Add links to property drawer
- This ensures results returned by semantic search contain these links
- This allows the user to jump to entry within original file for context
- The ID, file+heading based links are more robust to find relevant
  entry in original file than the line no based link,
  as edits being done by user to original files between embedding regenerations

src/processor/org_mode/orgnode.py

@@ -77,7 +77,7 @@ def makelist(filename):
                 deadline_date = ''
              thisNode.setProperties(propdict)
              nodelist.append( thisNode )
-             propdict = {'SOURCE': f'file:{filename}::{ctr}'}
+             propdict = {'LINE': f'file:{filename}::{ctr}'}
           level = hdng.group(1)
           heading =  hdng.group(2)
           bodytext = ""
@@ -114,7 +114,11 @@ def makelist(filename):
 
            prop_srch = re.search(r'^\s*:(.*?):\s*(.*?)\s*$', line)
            if prop_srch:
-              propdict[prop_srch.group(1)] = prop_srch.group(2)
+              # Set ID property to an id based org-mode link to the entry
+              if prop_srch.group(1) == 'ID':
+                 propdict['ID'] = f'id:{prop_srch.group(2)}'
+              else:
+                 propdict[prop_srch.group(1)] = prop_srch.group(2)
               continue
            sd_re = re.search(r'SCHEDULED:\s+<([0-9]+)\-([0-9]+)\-([0-9]+)', line)
            if sd_re:
@@ -145,11 +149,16 @@ def makelist(filename):
            if todoSrch.group(1) in todos:
                n.setHeading( todoSrch.group(2) )
                n.setTodo ( todoSrch.group(1) )
+
+       # extract, set priority from heading, update heading if necessary
        prtysrch = re.search(r'^\[\#(A|B|C)\] (.*?)$', n.Heading())
        if prtysrch:
           n.setPriority(prtysrch.group(1))
           n.setHeading(prtysrch.group(2))
 
+       # Set SOURCE property to a file+heading based org-mode link to the entry
+       n.properties['SOURCE'] = f'[[file:{filename}::*{n.Heading()}]]'
+
    return nodelist
 
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