Improve cross-platform compatibility #86
Merged
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When testing on Solaris 10, it was discovered there are quite a few incompatibilities caused by Solaris 10 not using GNU or POSIX-compliant commands by default.
These changes make things more compatible.
This fixes most of the things detailed in https://github.com/github/backup-utils/issues/85 - we just need to decide what we're going to do about the hashbang, if anything.