refactor fast track mirror list to include all synced mirrors for branch

update docs/man-page

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

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

create if not exist

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

fixed typo

updated docs

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

updated texts
updated docs
updated makefile
updated tests
removed deprecated arguments

updated texts
updated help texts for arguments