Moved file write init out of arguments

Added "with open()" to main loop.

Replaced argparse file-opening functionality using with open() loops in
order to more correcty handle file open/write/close and avoid error
states which could lock files open.
Cleaned directory and made package distributable

Removed extraneous files, reorganised package contents and created setup.py to allow installation of hiplex-primer as a python module (eg: installing using pip)
Merge branch 'package-test' into Kiwwa-dev

Updating Kiwwa-dev branch to incorporate software changes enabling distribution through pip.