Correcting issue #1 (false positife lookup for numerical file names

        modified:   tarindexer.py
Simplifed creation of record string

        modified:   tarindexer.py
Files opened with context to ensure, they get closed always

        modified:   tarindexer.py
Merge pull request #2 from vlcinsky/master

Corrected issue #1, reformatted record creation, opening files using "with"