Aleph-Driver
* fix typo in element name
* break comment message into two notefields of aleph (Z37_NOTE_1/2)
* both hold 50 characters each
* post comment message into two fields
* comments longer than 100 characters will be lost (before, more than 50 were lost)
Merge pull request #55 from swissbib/alephdriver

Aleph-Driver, comments in placehold()