Ignoring the bibase backup file
DB_File wasn't being used; removed mention of it
Made variables in bibase.pl lexical with 'my'
The settings filename is now standardised to bibase.settings

We used to use different versions depending upon if one was on MacOS or on
Linux or DEC.  This is now unnecessary, primarily because MacOS and DEC no
longer exist...
Made barename filehandle a lexical variable in bibase.pl

Also now using the 3 argument form for open()
Replace bareword filehandles with lexicals in startup.pl

Now also using the 3 argument form for open()
Using a default value for the DBFile and altDBFile variables
Localised more variables in bibase.pl
Turned on warnings in bibase.pl.  Corrected minor array-should-be-scalar errors
Using chomp instead of chop in bibase.pl
Using strict and warnings in startup.pl
Made the startup.pl script into the start of the Bibase.pm package
Added a test for the startup function