split: more strict

[mknos]

• Strict was disabled in function nextfile() but this masked that the program depends on a few global variables
• Declare the variables explicitly; FH becomes $Fh to avoid aliasing the name $fh which is used later on
• The benefit of the "package" declaration in nextfile() is unclear to me

[coveralls]

Pull Request Test Coverage Report for Build 10007819779

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.7%) to 76.268%

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Files with Coverage Reduction	New Missed Lines	%
bin/units	3	71.21%
<!--	Total:	3		-->

Totals
Change from base Build 10004906528:	-0.7%
Covered Lines:	376
Relevant Lines:	493

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💛 - Coveralls