initial support for alias
improved logging, check for empty alias
the alias must be passed in the URL
fixed log messages
fixed comment
moved the alias handling code to AddOnProduct::SetRepoUrlAlias()
added nil checks
added testsuite
added .gitignore
better comments
expand tabs
make possible to set the NFS mount options

fate#313208
expand tabs
fixed typo in Pos*t*processISOURL() function name
added changes
- 2.17.99
doocument the behavior if an alias is already present in the URL
added a note to translators
added changes
- 2.17.100