ensuring pot file is ajour

If conf. is not available on $prefix, .conf from host system is copied to $prefix and normalized to defaults before applying api configuration.
Updated docs to reflect change

refactored api check
if -S is used with -U branch is not written configuration file

added exit when using -U since updating mirrorlist fails on an empty chroot
updated docs

fixed typo

refactoring code to match #105
updated pot file
updated docs/man
updated CHANGELOG

updated texts
updated docs
updated makefile
updated tests
removed deprecated arguments

using pandoc