Multiple logic changes and new functionality

[mrautio]

• memory leak/handling fixes
• small performance improvements, remove dead code
• more logging in error cases
• new switch -L: support of skipping symbolic links in unix like environments. This is useful to prevent potential recursive infinite loops.
• new switch -p: disable circular searches of PAN numbers, i.e., disable/enable(=default) finding pan number in digit arrays like "123460110009901394241234"

[adamcaudill]

Thanks @mrautio! Some nice improvements, and great idea on -L! I'll take a closer look tonight, and get this merged.

[mrautio]

@adamcaudill have you had time to check this PR out?

[ramsaybell]

@adamcaudill Know this is an old PR, any chance you could have a look at getting this merged?