birth.specs: unified format for *birth.uni files:
                          column
		       begin----length
book                     1	4
page                     5	4
year                     9	3
month                    12	2
day                      14	2
priest                   16	25
fname child              41	15
sex of child             56	1
fname father             57	15
lname father             72	20
fname mother             92	15
lname mother             107	20
place of birth           127	15
fname godparent          142	15
lname godparent          157	20
place of godparent       177	15
legit                    192	1
comment                  193	3 
fname midwife         	 196	15
lname midwife         	 211	20
occup father             231	15