the code that parses magnetic variation, latitude, and longitude
entries from the database files. (The sign of the degrees entry was
not being inherited by the minutes field like the manual states).
Also, some miscellaneous improvements in the way of error checking
of the parsing of other database fields. Streamlined the functions
that open and validate the database files.

   Also, in output_text.c, I tweaked the printing of fuel amount and
rate fields. The heavy lift guys who measure in units of pounds were
having a problem with exceeding the field width (5 chars). For values
of 1000 or greater, the decimal point is dropped.

svn path=/trunk/; revision=51