Fix Note document type pdf conversion

Fix Note document type pdf conversion.

Possible solution:

1. parse the content of the Note document to find tags which references local nxpicsfile and nxfile URLs,
2. for each tag, extract the information to get the blob (document id, position from the blob holder),
3. read the blob from the binary store it in a temporary folder,
4. replace URL by absolute path to the blobs in the temporary folder.